The Fourth Cruzade

The Fourth Crusade (1202–1204) was a Latin Christian armed expedition called by Pope Innocent III. The stated intent of the expedition was to recapture the Muslim-controlled city of Jerusalem, by first defeating the powerful Egyptian Ayyubid Sultanate, the strongest Muslim state of the time. However, a sequence of economic and political events culminated in the Crusader army's 1202 siege of Zara.

The Republic of Venice contracted with the Crusader leaders to build a dedicated fleet to transport their invasion force. However, the leaders greatly overestimated the number of soldiers who would embark from Venice, since many sailed from other ports, and the army that appeared could not pay the contracted price. In lieu of payment, the Venetian Doge Enrico Dandolo proposed that the Crusaders back him in attacking the rebellious city of Zadar (Zara) on the eastern Adriatic coast. This led in November 1202 to the siege and sack of Zara, the first attack against a Catholic city by a Catholic Crusader army. The city was then brought under Venetian control. When the Pope heard of this, he temporarily excommunicated the Crusader army.

Reasons to go to Constantinople

The commercial rivalry between the Republic of Venice and the Byzantine Empire and the living memory of the Massacre of the Latins did much to exacerbate the feeling of animosity among the Venetians towards the Romans. According to the Chronicle of Novgorod Doge Enrico Dandolo had been blinded by the Emperor Manuel I Comnenus while part of an embassy to Constantinople in 1171, and accordingly held personal enmity towards the Byzantines.

Cruzader leader Boniface of Montferrat, met Alexios IV Angelos, son of the recently deposed Byzantine emperor Isaac II Angelos. Alexios IV offered to pay the entire debt owed to the Venetians, give 200,000 silver marks to the crusaders, 10,000 Byzantine professional troops for the Crusade, the maintenance of 500 knights in the Holy Land, the service of the Byzantine navy to transport the Crusader Army to Egypt, and the placement of the Eastern Orthodox Church under the authority of the Pope, if they would sail to Byzantium and topple the reigning emperor Alexios III Angelos, brother of Isaac II.

This offer, tempting for an enterprise that was short on funds, reached the leaders of the Crusade on 1 January 1203 as they wintered at Zara. Doge Dandolo was a fierce supporter of the plan; however, in his earlier capacity as an ambassador to Byzantium and someone who knew the finer details of how Byzantine politics worked, it is likely he knew the promises were false and there was no hope of any Byzantine emperor raising the money promised, let alone raising the troops and giving the church to the Holy See.

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.For both political and financial reasons, the permanent garrison of Constantinople had been limited to a relatively small force, made up of elite guards and other specialist units. On this occasion, the suddenness of the danger posed by the Fourth Crusade put the defenders at a serious disadvantage

Siege of July 1203

To take the city by force, the crusaders first needed to cross the Bosphorus. About 200 ships, horse transports, and galleys delivered the crusading army across the narrow strait, where Alexios III had lined up the Byzantine army in battle formation along the shore, north of the suburb of Galata. To take the city by force, the crusaders first needed to cross the Bosphorus. About 200 ships, horse transports, and galleys delivered the crusading army across the narrow strait, where Alexios III had lined up the Byzantine army in battle formation along the shore, north of the suburb of Galata.

The tower was swiftly taken as a result. The Golden Horn now lay open to the Crusaders, and the Venetian fleet entered. The Crusaders sailed alongside Constantinople with 10 galleys to display the would-be Alexios IV, but from the walls of the city citizens taunted the puzzled crusaders, who had been led to believe that they would rise up to welcome the young pretender Alexios as a liberator.

On 11 July, the Crusaders took positions opposite the Palace of Blachernae on the northwest corner of the city. Their first attacks were repulsed, but on 17 July, with four divisions attacking the land walls while the Venetian fleet attacked the sea walls from the Golden Horn, the Venetians took a section of the wall of about 25 towers, while the Varangian guard held off the Crusaders on the land wall.

Alexios III finally took offensive action, leading 17 divisions from the St. Romanus Gate, vastly outnumbering the crusaders. Alexios III's army of about 8,500 men faced the Crusaders' seven divisions (about 3,500 men), but his courage failed, and the Byzantine army returned to the city without a fight. The unforced retreat and the effects of the fire greatly damaged morale, and the disgraced Alexios III abandoned his subjects, slipping out of the city and fleeing to Mosynopolis in Thrace. The Imperial officials quickly deposed their runaway emperor and restored Isaac II, robbing the crusaders of the pretext for attack.

The crusaders insisted that they would only recognize the authority of Isaac II if his son was raised to co-emperor, and on 1 August the latter was crowned as Alexios Angelos IV, co-emperor.

Reign of Alexios IV

Alexios IV realised that his promises were hard to keep. Alexios III had managed to flee with 1,000 pounds of gold and some priceless jewels, leaving the imperial treasury short on funds. At that point the young emperor ordered the destruction and melting of valuable Byzantine and Roman icons in order to extract their gold and silver.

During the co-emperor's absence in August, rioting broke out in the city and a number of Latin residents were killed. In order to cover their retreat the Westerners instigated the "Great Fire", which burnt from 19 to 21 August, destroying a large part of Constantinople and leaving an estimated 100,000 homeless.

A nobleman Alexios Doukas (nicknamed Mourtzouphlos) became the leader of the anti-crusader faction within the Byzantine leadership. While holding the court rank of protovestilarios, Doukas had led Byzantine forces during the initial clashes with the crusaders, winning respect from both military and populace. He was accordingly well-placed to move against the increasingly isolated Alexios IV, whom he overthrew, imprisoned, and had strangled in early February. Doukas then was crowned as Emperor Alexios V.

War against Alexios V

The crusaders and Venetians, incensed at the murder of their supposed patron, demanded that Mourtzouphlos honour the contract that Alexios IV had promised. When the Byzantine emperor refused, the Crusaders assaulted the city once again

Although Innocent III had again demanded that they not attack, the papal letter was suppressed by the clergy, and the crusaders prepared for their own attack, while the Venetians attacked from the sea. Alexios V's army stayed in the city to fight, along with the imperial bodyguard, the Varangians, but Alexios V himself fled during the night. The crusaders completely took the city on 13 April.

Sack of Constantinople

The Crusaders looted, pillaged, and vandalized Constantinople for three days, during which many ancient and medieval Roman and Greek works were either seized or destroyed. The famous bronze horses from the Hippodrome were sent back to adorn the façade of St Mark's Basilica in Venice, where they remain. As well as being seized, works of considerable artistic value were destroyed for their material value.

Despite their oaths and the threat of excommunication, the Crusaders systematically assaulted the city's holy sanctuaries, destroying or seizing all that is deemed remotely of value; little was spared, and the tombs of the emperors inside the St Apostles church fell victim to such looting as well.

According to a prearranged treaty the empire was apportioned between Venice and the crusade's leaders, and the Latin Empire of Constantinople was established with Baldwin of Flanders as emperor. Byzantine aristocratic refugees founded their own successor states, the most notable of these being the Empire of Nicaea under Theodore Lascaris (a relative of Alexius III), the Empire of Trebizond and the Despotate of Epirus.

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