There was never a greater crime against humanity than the Fourth Crusade.
(Sir Steven Runciman, 1954)

Until I read John Julius Norwich’s account of the Fourth Crusade, which ended with the devastating sack of Constantinople in 1204, I hadn’t appreciate what a seismic and unmitigated disaster it was.

Norwich’s account of the Latins’ destruction of the biggest, richest city in the world was so harrowing I was depressed for days and found it difficult to continue reading the book in which he describes it, Byzantium: The Decline and Fall.

Like reading detailed accounts of Hiroshima, I just felt that…. after seeing humanity revealed in such appalling colours, why… why go on with anything?

For me, personally, the reason to go on is to understand better. Not to understand perfectly, which I am confident, or acknowledge, is beyond human wit. But just because perfect understanding is an impossible platonic absolute, doesn’t mean that some understanding isn’t better than none. And, for me, personally, understanding things brings sweet mental joy.

And so, just like Norwich’s detailed description of the Sack of Rome by Alaric and the Visigoths in 410, a detailed description of the Fourth Crusade and the Sack of Constantinople makes it so much more comprehensible. Only if you follow the events in the most detailed way possible do you realise that a distant event which is often treated as a single thing – the Sack of Constantinople – was in fact a complex concatenation of accidents and misunderstandings and misjudgements and bad agreements. It took the malevolence of some people (the doge of Venice), the chancer’s gamble of the pretender to the Byzantine throne Alexius III, and then the passive acquiescence of the majority of the crusaders, to take place. Reading the details makes you realise that a) this is how ‘history’ i.e. human events, work, in complex unexpected ways, where all kinds of spokes are stuck into the machine and b) makes you realise how the nature of human life, human experience, human societies, and big political events, doesn’t change much. I’m thinking of the sequence of events which brought about Brexit, and which we are still in the middle of. The results aren’t as murderous and destructive as the sack of Constantinople – but they are recognisably the product of the same confused, chaotic species.

In other words, reading about the sack itself is grim and depressing, but the knowledge and insight it gives you into human nature and how human affairs operate, are powerful and liberating.

Summary

This is the short version you’re likely to read in books focusing on other subjects, such as the crusades as a whole, or the Middle Ages.

In April 1204 the Latin, Western soldiers of the Fourth Crusade laid siege to Constantinople, capital of the Byzantine Empire. On 12 April the crusader armies breached the city’s defences and stormed the city. Attacking Venetian forces tried to use fire as a defensive shield but it quickly got out of control and burned unchecked through the city. As if that wasn’t catastrophic enough, once the crusaders had established a bridgehead, they proceeded to spend three days pillaging and looting the city.

The Greek emperor fled and leaders of the ruling families were driven into exile, so the crusaders chose a Latin ruler – Baldwin of Flanders – who was crowned Emperor Baldwin I and inherited about a quarter of the territory his Greek predecessors had ruled This Latin rule of the Byzantine Empire was to last just under 60 years, before a Greek ruler and army re-established Greek power.

After the city’s sacking, most of the Byzantine Empire’s territories were divided up among the Crusaders, but Byzantine aristocrats also established a number of small independent splinter states, one of them being the Empire of Nicaea, which would become the kernel of Greek resistance and – after a long series of small wars, setbacks and struggles to reunify Greek leadership – would eventually recapture Constantinople in 1261 and restore the Greek tradition and religion to the city of Constantine.

But the restored Byzantine Empire never managed to reclaim all its former territorial or economic strength, and eventually fell to the rising Ottoman Sultanate in 1453.

Background

The Latin West and Greek East of Christendom had been growing apart for centuries, with the pope in Rome arrogating more and more power and authority to himself, insisting the Eastern church submit to his authority, and Western clerics as a whole coming to regard the Eastern Orthodox church as schismatic and in error on a wide range of theological and procedural issues. Norwich’s three volumes of Byzantine history are littered with theological, administrative and geopolitical arguments between the papacy and the emperor or Patriarch (head of the Eastern Church) of Constantinople. This helps explain the indoctrination of western crusaders that the Byzantines were exotic, untrustworthy, almost heretics.

But the real focus of the story is the growing rivalry between the maritime republic of Venice, whose wealth was based on shipping and trading across the Muslim Middle East to the ‘Indies’ where spices and pepper came from, and Byzantium as the established power in the region. Successive emperors of Byzantium had been obliged to make trade treaties with Venice and given Venetian merchants extensive privileges in the city, such as an entire quarter down by the docks for their use and trading rights across the Empire’s territories and islands.

The sack had three causes:

1. long-term mistrust between Latin Westerners and Greek Byzantines
2. the long-term rivalry with Venice which wished to supersede Byzantium as the main power in the eastern Mediterranean
3. a short-term, proximate cause which was a string of accidents to do with the mismanagement of the Fourth Crusade, which were ruthlessly exploited by the doge of Venice, Enrico Dandolo, to fulfil point 2.

East-West relations

1. Mass arrest of the Venetians 1171

Latin Catholics from the rival cities Venice and Genoa dominated the city’s maritime trade and financial sector, having secured concessions from successive Byzantine emperors, which resulted in a virtual maritime monopoly and stranglehold over the Empire by the Venetians.

Rich Italian merchants grew very rich and so did the Byzantine aristocrats who allied with them, leading to popular resentment among the middle and lower classes in both the countryside and in the cities.

The Venetians resented that their main Italian rivals, the Genoese, also had extensive quarters in Constantinople, and in 1171 the Venetians attacked and largely destroyed the Genoese quarter. The Emperor retaliated by ordering the mass arrest of all Venetians throughout the Empire and the confiscation of their property (a move he had probably been meditating for some time – the Genoese attack gave him a pretext). As with all civil unrest, there were also rapes and the burning of houses. Infuriated, the Venetians launched a naval expedition to attack Byzantine interests, which failed, but the encouraged the Empire’s enemies, specifically the Serbs – to take advantage of the unrest and launch land attacks.

Relations were only gradually normalized, reaching an uneasy peace in the mid-1180s.

2. The massacre of the Latins

But the simmering resentment didn’t go away and burst out anew in the Massacre of the Latins which took place in Constantinople in April 1182.

After the death of Emperor Manuel I in 1180, his widow, the Latin princess Maria of Antioch, acted as regent to their son and became notorious for the favoritism she showed to Latin merchants and the big aristocratic land-owners.

In April 1182 she was overthrown by the ageing general Andronicus I Comnenus. He marched on Constantinople and entered the city in a wave of popular support. But the celebrations quickly got out of hand and escalated into mob violence against the hated Latins. The ensuing massacre was indiscriminate: Latin men, women and children were attacked in the street, their houses burnt down, Latin patients lying in hospital beds were murdered. Houses, churches, and charities were looted. Latin clergymen received special attention and Cardinal John, the papal legate, was beheaded and his head dragged through the streets at the tail of a dog.

Andronicus finally took control and curtailed the rioting, but the massacre obviously left profound bad feeling. The Normans under William II of Sicily in 1185 sacked Thessalonica, the Empire’s second largest city, while over the next decade or so, the German emperors Frederick Barbarossa and Henry VI both tried to get papal approval to mount an attack on Constantinople.

The Fourth Crusade

Henry VI’s failed expedition

This fraught relation between East and West, and especially between Byzantium and Venice, was the difficult background to the Fourth Crusade and largely explains what happened next.

The Third Crusade had ended in 1192 with a treaty signed between Richard I of England and Saladin, leader of the Saracen forces, agreeing that Jerusalem would remain under Muslim rule but that Christian pilgrims and traders would be assured safe passage to visit the city.

Almost immediately the failure to liberate Jerusalem led to calls for a new crusade to finish the job. In 1195 there was one of those large-scale western incursions into the area which aren’t included in the canonical ‘crusades’ but which Norwich describes in just as much detail – the steady rumble of expeditions, wars, raids, alliances and defeats which fill Norwich’s pages and help put the crusades into a broader context of unending conflict.

Henry VI, the second son of the Holy Roman Emperor Frederick Barbarossa, organised a new Eastern expedition and in the summer of 1197 a large number of German knights and nobles, headed by two archbishops, nine bishops, and five dukes, sailed for Palestine. There they captured Sidon and Beirut, but then the army heard that Henry himself had died at Messina in Sicily on his way to the Holy Land and many of the nobles and clerics returned to Europe. Deserted by much of their leadership, the rank and file crusaders panicked before the advance of a Muslim army from Egypt, and fled to their ships in Tyre. Thus ended this brief Western foray.

Pope Innocent III preaches the fourth crusade

Pope Innocent III succeeded to the papacy in January 1198 and immediately began preaching a new crusade. The kings of Germany, France and England were all distracted by dynastic squabbles, but the pope managed to get a leader in the shape of Count Thibaut of Champagne who, in 1199, committed to the crusade and began rallying knights. In the event, Thibault himself he died in 1201 and was replaced by an Italian count, Boniface of Montferrat.

Richard the Lionheart’s advice – attack Egypt

Now, on his return from the third crusade in 1192, King Richard of England had given his opinion that the main goal of any future crusade should be to seize Egypt. Jerusalem is far to the south of the east Mediterranean coastline and experience had shown that, going the land route through Anatolia (modern Turkey) tended to focus the military efforts of the crusaders on the territory they passed through – on Cilicia and Syria and Antioch and so on, in the north of Palestine – whereas Jerusalem is far to the south, much closer to the heart of what had been the Fatimid Dynasty in Egypt.

The idea being that whoever held Egypt would find it easy to secure Jerusalem as a strategic add-on and would have a strong secure hinterland. The leaders of the fourth crusade took all this on board and planned from the beginning to launch a naval campaign against Muslim Egypt.

The deal with Venice

However, an invasion of Egypt would require ships and the only Christian kingdom with the maritime capacity to help was Venice. Thus Boniface and the other leaders sent envoys to Venice, Genoa, and other city-states in 1200 to negotiate a contract for transport to Egypt.

Venice agreed to help. Specifically, Venice agreed to build the ships necessary to transport 33,500 crusaders across the Med. The agreement made for a full year of preparation on the part of the Venetians to build numerous ships and train the sailors who would man them. All this would take place at the cost of her own commercial activities. Venice also negotiated for permanent possession of ports seized in the Holy Land. The crusade was to be ready to sail on 24 June 1203 and make directly for the Ayyubid capital, Cairo. The agreement was ratified by Pope Innocent, with a solemn ban on attacks on Christian states.

However, nobody had enforced commitment to the Venice plan on the heterogenous armies and forces scattered all across Europe, and so various contingents sailed under their own steam from a variety of European ports. The number of crusaders who actually turned up at Venice in the appointed month of May 1202 was about a third of the expected 33,500.

Reasonably enough, the Venetians, under their aged and blind Doge Enrico Dandolo, would not let the crusaders leave without paying the full amount agreed to, some 85,000 silver marks. The crusaders could only manage 35,000 silver marks between them. This was disastrous for the Venetians, who had suspended their usual trading for a year, trained sailors and so on, in order to fulfil the deal.

Doge Dandolo proposes an attack on Zara

It is now that the Doge Dandolo starts to emerge as the wicked genie of the expedition. Dandolo proposed that to pay off their debts the crusaders should help Venice with a spot of bother: the port of Zara in Dalmatia had traditionally been dominated by Venice but had rebelled in 1181 and allied itself with King Emeric of Hungary. Dandolo told the crusaders they could pay off their debt if they helped Venice seize back control of Zara.

Now King Emeric was himself a Catholic and had taken the cross in 1195, so many of the crusaders understandably refused to countenance attacking Zara, and some, including a force led by the elder Simon de Montfort, returned home. Also, as soon as he learned about the proposal, the Pope wrote a letter to the crusading leadership threatening excommunication if they attacked another Christian state. However, this letter was kept secret from the ranks of the crusader army, which proceeded to take ship across the Adriatic and besiege Zara in November 1202.

Although the inhabitants of Zara hung banners from their buildings with crosses on to point out that they were fellow Christians, the crusaders quickly breached the walls and proceeded to ransack and pillage the city. Giving way to crude greed, the Venetians and other crusaders came to blows over the division of the spoils.

When Innocent III heard of the sack of Zara, he sent a letter to the crusaders excommunicating them and ordering them to return to their holy vows and head for Jerusalem. The leaders kept this letter from the troops, and replied to the pope that they had been forced to do it by the Venetians, having had no alternative between carrying out the attack or calling off the whole crusade.

The pope relented and in February 1203 rescinded the excommunications against all non-Venetians in the expedition. Somewhere someone must have done a study of just how ineffectual papal excommunications were in the Middle Ages.

The fatal deal with Alexius IV Angelus

Meanwhile, the nominal leader of the crusade, Boniface of Montferrat, had left the fleet before it sailed for Zara, to visit his cousin Philip of Swabia. At Philip’s court he found the exiled Byzantine prince Alexius IV Angelus, Philip’s brother-in-law and the son of the recently deposed Byzantine emperor Isaac II Angelus. (Isaac II had been deposed and blinded by his older brother, Alexius Angelus, who then claimed the throne as Alexius III. Alexius IV wasn’t Alexius IV yet, but would be if he could only reclaim the throne.)

Now Alexius proceeded to make the two would-be crusaders an offer: if they could get the crusaders to sail to Constantinople, and overthrow the reigning emperor Alexius III Angelus, and restore his father and himself to the Byzantine throne, then Alexius would:

1. use the wealth of the Byzantine Empire to pay the entire debt owed to the Venetians
2. give 200,000 silver marks to the crusaders
3. give 10,000 Byzantine professional troops for the Crusade
4. pay for the permanent maintenance of 500 knights in the Holy Land
5. offer the service of the Byzantine navy to transport the Crusader Army to Egypt
6. place the Eastern Orthodox Church under the authority of the Pope

This fantastic offer was passed on to the leaders of the Crusade as they wintered at Zara and they enthusiastically agreed, seconded by Doge Dandolo – although the latter knew that Alexius could never keep these promises: he knew that Byzantium didn’t have that much money and would never agree to submit its church to Rome. Dandolo did, though, see at a glance the benefits for Venice in such an arrangement, which were:

• revenge for the massacre of the Latins and other historical grievances
• seizure of Constantinople’s significant wealth
• by reinstating a large Venetian colony in the city, gaining a permanent commercial advantage over Venice’s rival, Genoa

Even now there were dissenters among the crusade’s leaders who (correctly) thought it was no part of a crusade against the Muslims to attack the mainstay of Christian power in the East. Led by Reynold of Montmirail, they sailed directly on to Syria.

Diversion of the crusade to Constantinople

But the majority of the fourth crusade now set sail for Constantinople in April 1203. The fleet consisted of some 60 war galleys, 100 horse transports and 50 large transports (manned by 10,000 Venetian oarsmen and marines). The Pope hedged and issued an order against any more attacks on Christians unless they were actively hindering the Crusader cause, but he did not condemn the scheme outright.

The crusaders attack Constantinople

When the Fourth Crusade arrived at Constantinople on 23 June 1203, the city had a population of approximately 500,000 people, a garrison of 15,000 men (including 5,000 Varangians), and a fleet of 20 galleys. Norwich emphasises that the city’s defences had been left to decay by the useless emperor Alexius III Angelus, and most of the galleys had fallen into disrepair.

The crusaders delivered their ultimatum demanding that that the emperor Alexius III should abdicate to make way for his nephew, Alexius IV. The emperor refused. The crusaders attacked the suburbs of Chalcedon and Chrysopolis. When about 200 ships, horse transports, and galleys delivered the crusading army across the narrow strait of the Bosphorus from Asia to Europe, Alexius III had lined up the Byzantine army in battle formation along the shore but, when the crusader actually knights charged, the Byzantine army turned and fled.

The Crusaders followed south along the shore and attacked the Tower of Galata. From this tower stretched a massive chain across the Golden Horn, the strait of water up the east side of the city, preventing entry to enemy ships. The crusaders took the tower and lowered the chain, allowing the Venetian fleet to sail up the Golden Horn. This is a narrow strip of water and the crusader galleys were able to come up close against the city’s seaward walls. Here they presented the pretender to the throne, Alexius IV, but were surprised when the people and soldiers of Constantinople jeered from the battlements. The crusaders had been told the people were in the grip of a cruel dictator and that they and Alexius would be greeted as liberators. Now they began to realise this was not true.

The crusaders set about attacking the city, combining an attack on the land walls at the north-west, with attacks on the sea walls from the fleet in the Horn. Eventually a breach was made and the crusaders entered the city. They were forced back by the Byzantine response and set a fire to keep off their attackers. This fire got out of control and was the first of the disastrous fires which were to burn through a large part of the city, this first one leaving an estimated 20,000 people homeless.

Alexius III made one last foray out to face the crusaders, but compounded his reputation for cowardice and ineffectiveness by turning his 8,500 men back in the face of the crusaders’ smaller force of 3,500. The impact of the fire and of this dismal capitulation led to a collapse in morale among the defenders. Alexius fled the city with his favourite daughter and courtiers.

The Byzantine officials now quickly declared the runaway emperor deposed and restored blind old Isaac II to the throne.

This presented the crusaders with a dilemma. The main, official, justification for the whole expedition was supposed to be restoring Isaac and his son, Alexius IV, who had proposed the whole scheme in the first place, to the throne. Now the Byzantines had called their bluff and restored Isaac. The crusaders responded that they would only recognize the authority of Isaac II if his son was raised to co-emperor, but the Byzantines again called the crusaders’ bluff by immediately agreeing to this, taking Alexius into the city and hurriedly arranging for his coronation at Hagia Sophia where he was crowned Alexius Angelus IV, co-emperor.

Alexius is unable to pay

As Norwich makes all too plain, Alexius now realised what a dreadful error he had made. The mismanagement of the Angelus dynasty over the previous decades had left Byzantium’s coffers bare, and Alexius III had made it worse by fleeing with as much imperial treasure as he could carry.

Alexius IV now ordered the seizure and melting down of priceless icons and church plate to use their gold and silver to pay off the impatient crusaders who were waiting across the Golden Horn in the suburb of Galata. Forcing the populace to destroy their most precious icons to satisfy an army of foreign schismatics did not endear Alexius IV to the citizens of Constantinople. Alexius negotiated a six-month extension to his pledge to the crusaders, making it now fall due in April 1204. Alexius IV then led 6,000 men from the crusader army against his rival Alexius III in Adrianople, with a view to seizing back the treasure his uncle had stolen and whatever could be ransacked from the Empire’s second city.

The Great Fire of Constantinople

But during the co-emperor’s absence in August 1203, rioting broke out in the city against the arrogant Latin occupiers, a number of whom were killed. In retaliation armed Venetians and other crusaders entered the city from the Golden Horn and, among other mayhem, discovered a church which had been converted into a mosque to cater to Constantinople’s not insignificant Muslim population. Citizens, both Greek and Muslim, rallied to the defence of this building and, to cover their retreat, the Latins started a fire, which – as is the way with fires – quickly spread out of control.

This became the ‘Great Fire’ of Constantinople which burnt from 19 to 21 August, destroying a large part of the city, consuming many ancient palaces and churches, and leaving an estimated 100,000 homeless. Amid the ruins the demoralised citizenry struggled on, while the crusaders waiting impatiently for their money.

The overthrow of Alexius IV

In January 1204, blind old Isaac II died, probably of natural causes, and rule now passed to his lamentable son, Alexius IV. The Byzantine Senate elected a young noble Nicolas Canabus to be co-emperor, in what was to be one of the last known acts of this ancient institution. However he declined the appointment and sought church sanctuary. Who can blame him?

Now during this period of crisis a nobleman called Alexius Ducas (nicknamed Mourtzouphlos, referring to his bush eyebrows) had led Byzantine forces during the initial clashes with the crusaders, winning respect from both the army and the people. And so it was Mourtzouphlos who one night entered the bed chamber of Alexius IV, told him there was rioting outside and the people were baying for his blood, led him through secret passages in the palace, to a dungeon where he chained and locked him up. Then returned to join his supporters and have himself proclaimed Emperor Alexius V. A few weeks later Alexius IV, the man who had caused all this trouble with his foolish promise to the crusaders, was strangled.

Alexius immediately took control of the Byzantine resistance and had the city fortifications strengthened, as well as recalling loyal troops from the provinces to bolster the Constantinople garrison.

The crusaders and Venetians, incensed at the murder of their supposed patron, demanded that Mourtzouphlos honour the contract that Alexius IV had made. The terms, if you remember, were to:

1. use the wealth of the Empire to pay the entire debt owed to the Venetians
2. give 200,000 silver marks to the crusaders
3. give 10,000 Byzantine professional troops for the Crusade
4. pay for the maintenance of 500 knights in the Holy Land
5. offer the service of the Byzantine navy to transport the Crusader Army to Egypt
6. place the Eastern Orthodox Church under the authority of the Pope

The crusaders renew their attack

Alexius V refused for the simple reason that there was nowhere near that much money in the imperial treasury. In March he ordered the forcible expulsion of all Latins from the city, which , and so in April the crusaders launched another attack on the city. Alexius V’s army put up a strong resistance, hurling projectiles onto the crusader’s siege engines, shattering many of them, and bad weather also hampered the attackers.

Pope Innocent III again sent a message ordering the crusaders not to attack, but once again the papal letter was suppressed by the clergy and never made public. While the Latin crusaders prepared to attack the land walls the Venetian fleet drew close to the sea-walls in an attempt to storm them.

On 12 April 1204, the weather conditions finally favoured the crusaders. A strong northern wind helped the Venetian ships get close to the seaward walls while on the land approach, the crusaders managed to make a hole in the walls through which a force of crusaders was able to crawl and overpower the defenders.

The crusaders captured the Blachernae section of the city in the northwest and used it as a base to attack the rest of the city. Alexius V fled the city accompanied by his wife and mother-in-law. In the Hagia Sophia Constantine Lascaris was acclaimed emperor but, when he failed to persuade the Varangian guard to continue the fight against the crusaders, in the early hours of 13 April he also fled, leaving Constantinople abandoned to the control of the Latins.

The sack of Constantinople

Over the centuries Constantinople had become a museum of ancient and Byzantine art. Having secured control of the city the crusaders proceeded to systematically sack and devastate it for three days. Churches and palaces were ransacked. Vast numbers of works of art were stolen, or melted down for their precious metals, or just burned and destroyed. Thousands of citizens were murdered or raped.

Despite the pope’s threat of excommunication, the crusaders destroyed, defiled and looted and set on fire the city’s churches and monasteries. Priests were abused, defrocked or murdered. In the greatest church in Christendom, Hagia Sophia, the crusaders melted down the silver iconostasis, smashed the icons, burned the holy books, and set on the patriarchal throne a prostitute who sang bawdy songs as the crusaders got drunk and pissed on the holy relics.

It was now that the Venetians stole the four statues of horses which they set up over the portico of St Mark’s cathedral in the main square in Venice. A large bronze statue of Hercules, created by the legendary Lysippos, court sculptor of Alexander the Great, was destroyed. Like countless other artworks, the statue was melted down for its metal value.

It was said that the total amount looted from Constantinople was about 900,000 silver marks. After the dust had settled the leaders of the ‘crusade’ made a big pile of their takings and divided up according to a pre-arranged deal. The Venetians took 150,000 silver marks that they reckoned was their due, while the crusaders took 50,000 silver marks. A further 100,000 silver marks were divided evenly up between the crusaders and Venetians. The remaining 500,000 silver marks were kept back by crusader knights and gangs.

When Innocent III heard of the conduct of his crusaders he was beside himself with rage. The whole episode sharply highlights the limits of papal power, and the ineffectiveness of even of the strongest weapon the pope possessed, that of excommunication. Various popes excommunicate numerous kings and emperors and princes throughout Norwich’s book and it never seems to have the slightest effect. In fact I wonder if there is a single example of the threat of excommunication making anyone (anyone of note, any leader) change their behaviour. In his shame the pope wrote:

As for those who were supposed to be seeking the ends of Jesus Christ, not their own ends, who made their swords, which they were supposed to use against the pagans, drip with Christian blood, they have spared neither religion, nor age, nor sex. They have committed incest, adultery, and fornication before the eyes of men. They have exposed both matrons and virgins, even those dedicated to God, to the sordid lusts of boys. Not satisfied with breaking open the imperial treasury and plundering the goods of princes and lesser men, they also laid their hands on the treasures of the churches and, what is more serious, on their very possessions. They have even ripped silver plates from the altars and have hacked them to pieces among themselves. They violated the holy places and have carried off crosses and relics.

The fourth crusaders

The naval attack on Egypt was never carried out. Only a relatively small number of the members of the Fourth Crusade finally reached the Holy Land. About a tenth of the knights who had taken the cross in Flanders arrived to reinforce the remaining Christian states there, plus about half of those from the Île-de-France. What a farce.

The Fourth Crusade – if indeed it can be so described – surpassed even its predecessors in faithlessness and duplicity, in brutality and greed. Constantinople in the twelfth century had been not just the wealthiest metropolis in the world, but also the most intellectually and artistically cultivated and the chief repository of Europe’s classical heritage, both Greek and Roman. By its sack, Western civilisation suffered a loss greater than the sack of Rome by the barbarians in the fifth century or the burning of the library of Alexandria by the soldiers of the Prophet in the seventh – perhaps the most catastrophic single loss in all history. (Norwich, p.182)

The aftermath – a Latin emperor and the Greek successor states

When the looting was quite finished and large parts of the once-glorious city burned to the ground, the crusaders convened to appoint a Latin emperor to take control of the city and the Byzantine Empire. Doge Dandolo wisely withdrew from the field of candidates and Boniface of Montferrat was deliberately rejected because of his family ties with the Greek regime. Several other crusader leaders were overlooked till they settled on the inoffensive Baldwin of Flanders. The Empire was now partitioned:

• Boniface went on to found the Kingdom of Thessalonica, a vassal state of the new Latin Empire.
• The Venetians founded the Duchy of the Archipelago in the Aegean Sea.
• A Duchy of Athens controlling most of Greece.

Byzantine refugees founded their own rump states, namely:

• the Empire of Nicaea, just across the Bosphorus on the Asian mainland, under Theodore Lascaris (a relative of Alexius III)
• the Empire of Trebizond far away on the south coast of the Black Sea
• the Despotate of Epirus on the Dalmatian shore opposite Italy

While Crete, Rhodes, Caphalonia and Corfu were permanently handed over to Venice.

Partition of the Byzantine Empire into The Latin Empire, Empire of Nicaea, and Despotate of Epirus after 1204 (source: Wikipedia)

Its enemies take advantage of the ruin of the Byzantine Empire

Norwich’s book takes a decisive turn after the sack of Constantinople. Up till then the reader had a reasonable grasp on the notion of one Byzantine Empire and one Byzantine emperor, who faced a sea of opponents to north, west and east.

But now there were no fewer than four emperors – the Latin one in Constantinople, the Greek one in Nicaea, one in faraway Trebizond and an aspirant one in Epirus (not to mention the Holy Roman Emperor based in Germany). Each of these are led by rulers who aren’t content with their holdings but immediately started scheming against each other, and involving the leaders of the lesser states – the Duchy of Athens, the Principality of Achaea and so on.

For the next fifty years or so, all these characters conspired against each other, fought against each other, made and broke alliances with each other – all the time doing the same with the many enemies who continued to surround and menace the Empire, from the Bulgarians and Serbs in the north, to the Seljuk Turks in the East.

Several of the major Greek and Latin protagonists in the events died or were killed soon after the fall of the city. The betrayal and blinding of Murtzuphlus by Alexius III led to his capture by the Latins and his execution in 1205. Not long after, Alexius III was himself captured by Boniface and sent to exile in Southern Italy. He died in Nicaea in 1211.

On 14 April 1205, one year after the conquest of the city, the Latin emperor Baldwin was decisively defeated and captured at the Battle of Adrianople by the Bulgarians. In 1205 or 1206, the Bulgarian Emperor Kaloyan mutilated him and left him to die (others suggest he was kept captive in the famous Baldwin’s Tower in the Bulgarian capital Veliko Turnovo, where he died under unknown circumstances). Either way, he only lasted a year as the ruler of the Latin Empire and that Empire was to lead a stunted, blighted life, menaced on all sides and deprived of all economic livelihood.

Baldwin was succeeded by his brother Henry of Hainault who appears to have been a wise and fair king, liberal to his Greek subjects, and who – beside battling the troublesome Bulgarians – reached a peace settlement with the Greek Empire based in Nicaea.

The Latin Empire always rested on shaky foundations but it took nearly sixty years before the city was finally retaken by the Nicaean Greeks under Michael VIII Palaeologus in 1261. But it was a ruined wreck of a city, as Norwich’s desolate description makes clear. Many of the churches and palaces still lay abandoned ruins. The population had collapsed. The city was never to recover.

Conclusion

The sack of Constantinople was a major turning point in medieval history. The Crusaders’ decision to attack the world’s largest Christian city was controversial at the time and has been ever since. Reports of Crusader looting and brutality horrified the Orthodox world and crystallised bitter opposition to the barbarian West.

Relations between the Catholic and Orthodox churches were blighted, arguably right up to the present day. Norwich makes the point that, as the Turks drew nearer in the coming centuries, most Byzantines, whether aristocrats or peasants, preferred the idea of subjection by the Muslims to the barbaric destructiveness of the West Europeans. The Byzantines had a saying, ‘Better a turban than a cardinal’s hat,’ and they meant it.

So much for East-West relations, but the main and obvious result of the sack was that the Byzantine Empire was permanently crippled. Broken up into a number of successor states, it was never to be really unified again, never able to muster the resources in men and goods necessary to hold off its enemies, especially the Ottoman Turks who would begin their rise to power 200 years later.

The actions of the Crusaders thus directly accelerated the collapse of Christendom in the East, and in the long run facilitated the expansion of Islam across the Bosphorus and right into the heart of Europe. In 1529 the Ottoman Turks led by Suleiman the Magnificent were to lay siege to Vienna.

So you could argue that the net effect of the entire crusading enterprise was not only to leave an enduring legacy of bitterness throughout the entire Muslim world and among the Greek Orthodox eastern world – but also to hand the Middle East, all of Anatolia and half the Balkans over to Muslim occupiers.

Was ever a mass social movement and religious undertaking so utterly and completely counter-productive?

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