William de Fortibus (also styled le Fort), son and heir, died shortly before 22 May 1259, lord of Chewton, Somerset, married circa 30 July 1248 Maud (or Matilda) de
Ferrers, born circa 1230, died 12 Mar 1298/9, widow of Simon IV de Kyme, died 1248, lord of Sotby, county Lincoln, and daughter of William de Ferrers, Earl of Derby by his wife Sibyl Marshal. Maud married (3) by 4 Feb 1267 Sir Emery (or Almery), Vicomte de Rochechouart in Poitou, living apr 1284. [Complete Peerage IV, 199 chart; Sanders, Baronies, pp. 9, 38-39, 62-64, 79-80. Knights of Edward I, II 80, IV 156; Cal. Inquest p.m. 1: 298, 3: 400-401; Cal. Patent Rolls, Henry III, 1247-1258, p. 23; List of Ancient Correspondence of the Chancedry and Exchequer, Lists & Index, no. XV, p. 355].532