Gilbert Basset, of Wycombe, and (2) (as his second wife) Reginald II de Mohun, feudal barony of Dunster in Somerset, father-in-law of her sister Joan. Maud de Ferrers (died 12 March 1298), who married (1) Simon de Kyme (died 1248), (2) William de Vivonne (died 1259), and (3) Amaury IX, Viscount of Rochechouart. Sibyl de Ferrers, who married (as his first wife) Frank de Bohun, of Midhurst, great-nephew of Savaric FitzGeldewin; Joan de Ferrers (died 1267) married: (1) Sir John de Mohun, master of Dunster (died 1253 in Gascony), with John de Mohun (1248–79), feudal baron of Dunster as probable issue; and (2) (as his first wife) Sir Robert II Aguillon of Addington; Agatha de Ferrers (died May 1306), married Hugh Mortimer, younger son of Ralph de Mortimer; Eleanor de Ferrers (died 16 October 1274) married (1) William de Vaux, (2) in about 1252 (as his 3rd wife) Roger de Quincy, 2nd Earl of Winchester, and (3) in about 1265 Roger de Leybourne. To Margaret de Quincy He married (2nd) in 1238 Margaret de Quincy (c. 1218 - 12 March 1280), daughter and heiress of Roger de Quincy, 2nd Earl of Winchester, by his wife Helen of Galloway. When Margaret's father married (as his 3rd wife) Eleanor de Ferrers (d.1274), she became both step-mother and step-daughter of Eleanor. By Margaret de Quincy he had two sons and three daughters: Robert de Ferrers, 6th Earl of Derby (1239–1279), eldest son and heir, who married firstly (aged 10) Mary de Lusignan, a daughter of Hugh XI de Lusignan, Count of Angoulême, and a niece of King Henry III. He married (2nd) in 1269 Eleanor de Bohun, daughter of Sir Humphrey V de Bohun, of Kimbolton Castle, by his wife Eleanor de Braose. William de Ferrers (1240–1287), of Groby in Leicestershire, younger son, who having been granted by his mother Groby Castle, founded the junior line of Ferrers of Groby. He married firstly Anne Durward, possibly the widow of Colbán, Earl of Fife and a daughter of Alan Durward, by whom he had issue: William Ferrers, 1st Baron Ferrers of Groby (1272–1325), who assumed the arms of de Quincy (Gules, seven mascles or conjoined 3:3:1) in lieu of his paternal arms; He married (2nd) Eleanor de Lovaine, a daughter of Matthew de Lovaine, who after her husband's death was abducted by and married to William the Hardy, Lord of Douglas. Joan de Ferrers