After attacking Zara at the request of the Doge of Venice, Enrico Dandolo, the members of the Fourth Crusade headed toward Constantinople. Why Constantinople and not the Holy land? After the siege, one of the leaders, Marquis Boniface of Montferrat, had left Zara to visit his cousin, the King of Germany, Philip of Swabia. There he met a Byzantine prince in exile, Alexios Angelos. His father, Isaac II Angelos, had had the throne usurped by Isaac's brother, Alexios III, who had Isaac blinded (rendering him unfit to rule) and imprisoned. Alexios wondered if the Crusaders would help put him on the throne that had been usurped from his father.
Alexios offered 10,000 Byzantine soldiers to join the Crusade if he were made emperor, as well as 500 knights to stay in the Holy land to maintain order. (The sketch above is from the Doge's Palace in Venice, and shows Alexios at Zara requesting aid.) He also offered ships and money to pay off the debt to Venice, as well as having the Greek Orthodox Church accept the pope's authority, and an additional 200,000 silver marks.
This sounded too good to be true...and it was. But at the time it seemed like a deal that could not be passed up. (Not everyone thought this was a good idea: Simon de Montfort, for instance, was opposed. They should have listened to him.)
The Crusader fleet arrived at Constantinople in 1202. The came up to the walls of the city and showed Alexios, telling the people that their rightful ruler had been brought to them. The reaction was less than enthusiastic. The usurper, 50-year-old Alexios III, had ruled well since 1195. The 20-year-old prince Alexios was untried as a ruler. Change for the sake of change did not appeal to the citizens of Constantinople.
The Crusaders were patient, setting up camp and taking their supplies from the countryside, but on 18 July 1203 they lost their patience and attacked Constantinople. Emperor Alexios III, seeing that the invaders were finally serious, fled. When the city gates were opened up the next morning, the Crusaders and Alexios entered to find that the citizens had released Isaac from prison and declared him emperor, even though his blindness disqualified him. They apparently preferred a seasoned politician over the untried youth. The Crusaders, showing a constant disregard for local politics, forced Isaac to declare his son co-emperor, making him Alexios IV Angelos.
So now Alexios had the authority to make good on his promises and reward the Crusaders. That's when the real trouble started.
You may recall that a few days ago I said I would explain one of the sources of Byzantine culture that influenced Italian art, etc. We are getting closer. See you next time.
