The French scaled the walls, the usurper fled, and blind old Isaac was led out of his dungeon, and dressed in his robes again; his son was crowned to reign with him, and they did everything to please the Crusaders.  Chiefly they made the Patriarch of Constantinople consent to give up all the differences with the Roman Catholic Church, and own the Pope as superior to him.  This made the Greeks angry, and they could not bear to see their young emperor so familiar with the French knights, whom they looked on as barbarians.  One day he was seen with a Frenchman’s cap on his head, and his own crown lying on the ground at his feet.  In great anger the people of Constantinople rose, under a man named Alexius Ducas, called “Black-brows,” murdered the two emperors, and set up this new one; but he did not reign long, for the French and Venetians were close at hand.  There was a second siege, and when the city was taken they plundered it throughout, stripped it of all the wealth they could collect, and set up Baldwin, Count of Flanders, to be emperor, with a Latin Patriarch; while the Venetians helped themselves to all the southern part of the empire, namely, the Peloponnesus and the Greek islands; and a French nobleman named Walter de Brienne was created Duke of Athens, under the Flemish emperor.