Willelm Giffard wæs clerc fram Normandige se wæs Hlaford-Canceler to twæm cyningas; Willelm II and Henric I, fram 1093 to 1101. He wæs Bisceop of Wintanceastre from .mc. to .mcxxix.
On 3 Weod. 1100 genamode Henric Cyning Willelm to þæm bisceoprice of Wintanceastre. Man aliefð ðe Henric geaf him his stole to gewinnenne þære Cirican fultum for his ontalu to þæm cynedom æfter Willelmes deaþ cyning. Noðylæs, Ansealm Ercebisceop him anrædlice forwernde.
In þæm Cranic for .mciii. we leornað:
| “ | Her on þisum geare to midewintra wæs se cyng Heanrig æt Westmynstre. ⁊ þær æfter sona ferde se biscop Willelm Giffard ut of þis land. forþan þe he ongean riht nolde his hades onfon æt þam arcebiscop Girarde of Eoferwic. ⁊ þa to þan Eastran heold se cyng his hired on Winceastre. | ” |
In .mcxxix. secgð se Cranic:
| “ | Ðis ilces geares forðferde se biscop Willelm Giffard of Winceastre ⁊ þear bebyriged on viii kalendæ Februarii. ⁊ se kyng Henri geaf þone biscoprice æfter Micheles messe þone abbot Henri his nefe of Glastingbyri. | ” |