Ralph d'Escures was a medieval abbot of Séez, bishop of Rochester, and then archbishop of Canterbury. He studied at the school at the Abbey of Bec. In 1079 he entered the abbey of St Martin at Séez and became abbot there in 1091. He was a friend of both Archbishop Anselm of Canterbury and Bishop Gundulf of Rochester, whose see, or bishopric, he took over on Gundulf's death.

Gundulf was a Norman monk who went to England following the Norman Conquest. He was appointed Bishop of Rochester and Prior of the Cathedral Priory there. He built several castles, including Rochester, Colchester and the White Tower of the Tower of London, and the Priory and Cathedral Church of Rochester.