In 1099 Peter appears as the treasurer of the alms at the siege of Arqa, and as leader of the supplicatory processions around the walls of Jerusalem before it fell, and later within Jerusalem which preceded the Crusaders' surprising victory at the Battle of Ascalon (August). At the end of 1099, Peter went to Latakia, and sailed thence for the West. From this time he disappears from the historical record. Albert of Aix records that he died in 1131, as prior of a church of the Holy Sepulchre which he had founded in France.