In 1153 Fulk was present at the Siege of Ascalon, where he carried the relic of the True Cross. In 1155 he was involved in a dispute with the Knights Hospitaller, who refused to pay tithes to the church; they also interrupted Fulk's preaching at the Holy Sepulchre, and at one point, according to William of Tyre, shot arrows into the church. Fulk and the other ecclesiastical prelates of Outremer travelled to Rome to complain directly to Pope Hadrian IV.