The Sultan , al - Kamil , a nephew of Saladin , had succeeded his father as Sultan of Egypt in 1218 .
The Sultan , al - Kamil , a nephew of Saladin , was encamped upstream of Damietta , unable to relieve it .
The Sultan , al - Kamil , a nephew of Saladin , had succeeded his father as Sultan of Egypt in 1218 and was encamped upstream of Damietta , unable to relieve it .