 Walter's son and heir Robert fitz Walter (who married Sybil de Caisneto) founded the church of St Peter at Sibton in the time of William Rufus, and had three sons, Roger, John and William, of whom Roger and John had no offspring.When Robert (who in 1105 also founded the Benedictine priory of Horsham St Faith nearby) died, his son John, afterwards called John "vicecomes" (i.e., the Sheriff), inherited the Barony of Horsford.After some time, when he was stricken with a grave illness, he bethought himself to construct a Cistercian abbey in atonement for his many evil deeds both in times of peace and war.