"Walter Deyncourt came from Ancourt (Seine-Inférieure, arr. Dieppe, cant. Offranville). He was a kinsman of Remigius, first Norman bishop of Lincoln (1072-92), who was formerly a monk and the almoner of the Norman abbey of Fécamp. ... Remigius provided King William I with a contingent of ships to enable him to invade England. At what time Walter Deyncourt arrived in England is unknown for his first recorded appearance in history is in Domesday. The only other documentary appearance of Walter 1st baron was as a witness to the confirmation made by William II to the Warenne foundation of Lewes priory (Cluniac, Sussex) dated 1088-91. Walter was the thirteenth witness out of twenty." [Trevor Foulds, The Thurgarton Cartulary, Stamford: Paul Watkins, 1994, p. lv]
"In 1086 Walter 1st Baron Deyncourt held lands as a tenant-in-chief in five counties: Derbyshire (six manors), Lincolnshire (sixteen manors), Northamptonshire (one manor), Nottinghamshire (eighteen manors) and Yorkshire (two manors). ... The Domesday holdings were derived from at least five antecessors, Tori, Hamine, Swain cilt, and Wada, and ten other men, Siward and Elwi, Archil and Leuric, Godric, Aldene and his two brothers, Wulfric, and Swain (possibly the same person as Swain (cilt)." [Trevor Foulds, The Thurgarton Cartulary, Stamford: Paul Watkins, 1994, p. xl-xli]