In Domesday William fitz Ralf held 2-1/2 hides in Lutton and in Castor, Northants., of the Abbot of Petersborough and he also held a fee in Massingham and Butterwick, Co. Lincs. His successor appears to have been his son, Ralf fitz William, who held in the time of Henry I (V.C.H. Northants., vol. I, pp. 315b, 387b; II, p. 584; Bridges Northamptonshire, vol. II, pp. 402, 500) and these passed to John, son of William de Douvres, who mortgaged Lutton to Aaron of Lincoln, the Jew, for 50 marks, which on his death becme payable to the King (Pipe R. Northants., 3 rich. I, 1191/2). John's son, Fulbert de Douvres, paid a fine to be quit of all debts owed by his father to the Jews (Pipe R., 10 Rich. I, 1191/2). Henry of Pytchley, the monk of Peterborough, records that William fitz Ralf was the first feoffee of Lutton and that therafter a cerain Fulbert de Douvres held it and that the heirs of Fulbert held 4 hides in Luddington and Castor and 1-1/2 virgates in Lincs. and 4 carucates in Massingham in that county by service of 3 knights' fees (Henry of Pytchley's Book of Fees, Northants., Rec. Soc., pp. 46, 49n).175

Fulbert de Douvres was evidently a minor at his father's death, and in 1 John (1199/1200) he fined to have seisin of the castle and vill of Chilham, agreeing to stand judgment in the Curia Regis if the King or any other should challenge his claim (Obl. R., 1 John m.23; p. 1).175

In the return of 1201/2 Fulbert de Douvres held thirteeen knights' fees of the old and one of the new feoffment (Red Bk., p. 135). "Fulbert, son of John de Douvres", confirmed to St. Bertin, as the legitimate heir, the grant of Chilham Church, which his father's uncle Hugh had made to that Abbey about 1199/1200. He sealed with arms checquey a luce hauriant (clearly a variation of his mother's Lucy coat). About 1199 he acknowledged that he had no right of preemption of the tithes of Chilham Church, notwithstanding his conventions with the monks of St. Bertin (Rounds Cal. Doc. France, p. 490; Arch. Cant., vol. IV, pp. 213,215). He witnessed the foundation charter of William Briwere to Tor Abbey, 1189-1199 (Mon. Ang., 1st ed., vol. II, p. 653). Fulbert died, a young man, in or about 1204, and the custody and marriage of his heir was granted to William Briwere, the famous official of king Richard I and John.175

Weis" "Ancestral Roots. . ." (26:27), calls him Fulbert of Dover. Cokayne's "Complete Peerage" (Berkeley, p.127), calls him Robert of Dover.