The doge, Enrico Dandolo, was already old and nearly blind. He was elected at the age of eighty-four, but he was one of those Venetian patriarchs whose tenacity and singleness of purpose were the visible proof of the city’s own ruthlessness. It was said that he had nourished a grievance against Constantinople ever since the mass imprisonment of 1171. According to one Byzantine Greek chronicler, “he boasted that so long as he failed to take revenge on them for what they had done to his people he was living under sentence of death.” It was even reported, in later chronicles, that he had been blinded by the Byzantines themselves when he had once travelled to the city as an ambassador; this is the stuff of legend only.
The carpenters of the Arsenal were set to work, engaged to build and equip enough ships to carry 4,500 horsemen and 30,000 soldiers. In return Venice demanded 84,000 silver marks. The efficiency of the shipbuilding yards was by now well known throughout Europe, and all of the ships were delivered on time. But there was one problem. The crusaders had been unable to find the money to pay for them. So a new arrangement was concluded. The Venetians would waive full payment, on condition that the crusaders would assist them in subduing the rebellious city of Zara on the Dalmatian coast. It was a diversion from the Holy Land, but the leaders of the forces of the cross considered it to be a necessary one. Three hundred ships left the lagoon in October 1202, to the chant of the
Once the Venetians were fully in possession of the town, they were surprised by the arrival of an unexpected guest. The son of the deposed emperor of Constantinople, Alexius Angelus, came to Dandolo in search of justice. He wished the crusaders to overthrow the usurper, on the throne of the empire, and reinstall his father. For his part he pledged to finance and otherwise assist the armies in their high purpose. It was an offer that could not be refused. It has often been surmised that Dandolo had held this aim in mind throughout all the preparations for the crusade, and that he had already determined that Constantinople rather than Syria was to be the destination of the Venetian fleet. There can be no doubt that Dandolo saw a great opportunity for advancement and enrichment in this war at the expense of Constantinople. But there are elements of adventitious chance in all the affairs of men. Dandolo could not have known that the French crusaders would be unable to honour their obligation, although it is likely that he knew in advance of the arrival of Alexius in Zara. The Venetians were always adept at taking advantage of chance and circumstance. Yet in another perspective the great events of the world seem, on close scrutiny, to be made up of a thousand singular elements and accidents and coincidences. In the midst of this swirling world it would be hard to detect a pattern. So we may say that
The Venetian fleet, in aid of Alexius, moved against the city. On 24 June 1203, it sailed beside the walls. A French attack by land seemed to have failed and so, under the command of Dandolo, the Venetians tied their galleys together to form a united front; from the decks and turrets of the vessels, military engines discharged their fire into the city. Constantinople was in flames. Dandolo himself stood at the prow of the first ship that struck land. He was dressed in full armour, and the standard of Saint Mark flew at his side. At his urging the Venetian soldiers leapt from their vessels and scaled the ladders swung against the walls. There was some combat, but the forces of the Byzantines were overwhelmed by this swift attack from the sea. The banner of the republic was fixed on the rampart. The city was taken. The deposed emperor, on whose behalf Alexius had pleaded, was rescued from his dungeon and placed upon the throne. Alexius himself was crowned in the basilica of Saint Sophia, and took his place as co-ruler of the empire.
Yet the fatal decline of Constantinople was about to resume its inevitable course. Alexius had promised the crusaders more than he could achieve. He lacked finance and, more importantly, he had forfeited his authority among his countrymen by relying upon the forces of the crusaders to obtain the imperial crown. The citizens of Constantinople, instigated by fear and rumour, rebelled against the new emperor. Alexius was cut down, his father abandoned to his grief.