Research Notes:

Orderic Vitalis records that, after the death of Williame de Warenne Earl of Surrey, “præfati consulis filii Guillelmus et Rainaldus” succeeded “cum Gundreda matre sua” [incorrect, as their mother was already deceased], dated to 1089. "Willelmo et Reynaldo filiis et heredibus meis" are named in the charter of "Willelmus de Warenna…Surreie comes" dated 1080. He inherited his mother's possessions in Flanders. He supported Robert "Courthose" against his brother Henry I King of England, was captured in 1106 but released before the battle of Tinchebrai. ^{1 2}