But in 1203, a new and unexpected danger arose to scare him from his feasting. His blind brother Isaac had a young son named Alexius, who escaped from Constantinople to Italy, and took refuge with Philip of Suabia, the new Emperor of the West. Philip had married a daughter of Isaac Angelus, and determined to do something to help his young brother-in-law. The opportunity was not hard to seek. Just at this moment a large body of French, Flemish, and Italian Crusaders, who had taken arms at the command of the Pope, were lying idle at Venice. They had marched down to the great Italian seaport with the intention of directing a blow against Malek-Adel, Sultan of Egypt. The Venetians had contracted to supply them with vessels for the Crusade, but for reasons of their own had determined that the attack should not fall on the shore for which it had been destined. They were on very good terms with the Egyptian sovereign, who had granted them valuable commercial privileges at Alexandria, which threw the whole trade with the distant realms of India into Venetian hands. Accordingly they had determined to avert the blow from Egypt and turn it against some other enemy of Christendom. The leaders of the Fourth Crusade proved unable to pay the full sum which they had contracted to give the Venetians as ship-hire, and this was made an excuse for keeping them camped on the unhealthy islands in the Lagoons till their patience and their stores were alike exhausted. Henry Dandolo, the aged but wily doge, then proposed to the Crusaders that they should pay their way by doing something in aid of Venice. The Dalmatian town of Zara had lately revolted and done homage to the King of Hungary; if the Crusaders would recover it, the Venetian state would wipe out their debts and transport them whither they wished to go. The Crusaders had taken arms for a holy war against the Moslems. They were now invited to turn aside against a Christian town and interest themselves in Venetian politics. Conscientious men would have refused to join in such an unholy bargain, and would have insisted in carrying out their original purpose against Egypt. But conscientious men had been growing more and more rare among the Crusaders for the last hundred years. There were as many greedy military adventurers among them as single-hearted pilgrims. The more scrupulous chiefs were over-persuaded by their designing companions, and the expedition against Zara was undertaken.