 Knowing that he could not live long, he made his brother and heir William (William de Chesney, or William de Cayneto) promise to perform what he had vowed, to complete and construct the Cistercian abbey.Then after John died, William held the barony, and after some time ruled the county as William "vicecomes".He, mindful of the welfare of his brother's soul, fulfilled his promise and founded the abbey of St Mary of Sibton, granting his lands at Sibton and his charter of confirmation dated 1149.