In late 1202, financial issues led to the Crusader army conducting the Siege of Zara, sacking the Catholic city of Zara (Zadar) on the Adriatic Sea, which was then brought under Venetian control. When the Pope heard of this, he excommunicated the Crusader army. In January 1203, en route to Jerusalem, the Crusader leadership entered into an agreement with the Byzantine prince Alexios Angelos to divert the Crusade to Constantinople and restore his deposed father Isaac II Angelos as emperor. The intent of the Crusaders was then to continue to Jerusalem with promised Byzantine financial and military aid. By this time the Pope had excommunicated them. On 23 June 1203, the main Crusader army reached Constantinople, while other contingents (perhaps a majority of all crusaders) continued to Acre.