Henry III King of England granted letters of conduct to "Willelmus Maudut" to "comitem W. Marescallum, ad loquendem cum eo de deliberacione R. patris sui" dated [early] 1217. "William Mauduit" gave pledges for "full seisin…of all lands…of which Robert Mauduit his father was seised on the day he died" in Hampshire, dated [Jun] 1222. "William Mauduit" paid homage to the king for "the lands that Isabella Basset, mother of the said William, whose heir he is, held in chief in his bailiwick", dated 11 Dec 1225. A charter dated 3 Feb 1247 records a final agreement between "Johannem de Plesseto" and "Willelmum Mauduyt et Aliciam uxorem eius", relating to "maneriis Warwyk…pertientibus ad comitatum Warr, unde Thomas frater Margerie uxoris eiusdem Johannis, cuius heres ipsa est", agreeing the succession of the latter if the wife of the former died without heirs. 1
Robert de Burneby and Joanna, John le Brun and Alice, Richard Burdun and Egelina, and Ralph de Wedon and Laurencia - brought a suit against William Mauduit for four parts of the manor of Letcombe Basset as their rightful inheritance. William responded that they had no claim, since Thurstan had granted the manor to William by his charter for the service of 2 knights. The plaintiffs countered that Thurstan had suffered a paralytic stroke before making the grant, so that he was enfeebled and his memory failed him. Thurstan never improved and steadily deteriorated. William claimed on the contrary that Thurstan was of sound mind and fit memory when the charter was drafted on 24 June and that on the following 29 September Thurstan married off his daughter and travelled with her to a monastery.
Calendar of Fine Rolls, Henry III