Humphrey married Isabella in Kerak Castle in the autumn of 1183. During the wedding, Saladin laid siege to the fortress to take revenge for Raynald of Châtillon's plundering raid on the Red Sea in February. According to a version of Ernoul's chronicle, Humphrey's mother convinced Saladin not to bombard the tower in which the newly married young couple were lodged, although he continued to besiege the rest of the fortress. Kerak was eventually relieved on 4 December by Baldwin IV and Raymond III of Tripoli.