The Sibton Abbey Cartularies and Charters includes the following account of the family of the Sibton Abbey founder, William de Chesney: [1]
Sybil, the sister of John de Chesney [Cayneto in the transcription in Latin] and daughter of Ralph de Chesney who came over at the conquest, married Robert son of Walter founder of the priory of Horsham St Faith and they had three sons, Roger, John the Sheriff and William de Chesney founder of the abbey of Sibton. Roger and John died without issue, William married and had three daughters, Margaret, Clemence and Sarah. Clemence and Sarah died without issue (in error, see note 2). Margaret married a Norman, Hugh I de Cressy, and they had a son Roger II de Cressy. Roger married Isabel de Ria and they had four sons, Hugh II, Roger III, John, and Stephen, who all died without issue. Margaret married secondly Robert I son of Roger and they had a son, John son of Robert. John had a son, Roger, who had a son Robert II son of Roger who is now patron and who after the death of Stephen de Cressy succeeded to the inheritance of the barony of Horsford as the heir of Margaret de Chesey. This Robert married Margaret de la Suche and they had many sons and daughters. [The transcription in Latin does not number the Hughs, Roberts, and Rogers.]
Domesday Descendants provides the following description: [2]
de Caisneto, Willelm Filius Roberti. Son of Robert fitz Walter de Caen and Sybil de Chesny; succeeded to his father's barony of Horsford after the death of his brother John c. 1149. Founder of Sibton Abbey, he and his brother John (d.c. 1144) supported the Angevins during the civil war. Sheriff of Norfolk and Suffolk 1146-54, 1156-63. Given the barony of Blythburgh, Suffolk, for one fee in 1157/57 (Pipe Roll 4 Henry II, 125; Sanders, 16). Acquired the fees of Baldwin fitz Gut Angevin in the honour of Boulogne, possibly through his marriage to Gilla. He died in 1174, leaving daughters Margaret, wife first of Hugh de Creissy and secondly of Robert fitz Roger of Clavering, Clemence, wife of Jordan de Sackville, and Sara, wife of Richard Engaine.
[1] Philippa Brown, ed., Sibton Abbey Cartularies and Charters, 2 vols. (Boydell Press, 1987), 2:8-9.
[2] K. S. B. Keats-Rohan, Domesday Descendants, A Prosopography of persons occurring in English documents, 1066-1166: II Pipe Rolls to Cartae Baronum (Boydell Press, 2002), 317.