Arms of William de Lanvallei, Lord of Standway Castle
William de Lanvallei III (died 1217) was an English landowner, governor of Colchester Castle, and a Magna Carta surety. He was lord of  Walkern. William III accompanied  King John of England on his expedition to Poitou in 1214 and was present at the truce. William III was related to several of the Magna Carta barons. 
William III's grandfather, William I (1125-1180), was an administrator for
Henry II of England and came to England from Brittany. William I married Gunnora, the daughter of Hubert de Saint Clair (1120-1155).
William II (c.1161-1204), son of William I, married Hawise, great-granddaughter of
Hugh de Bocland ( Buckland, Oxfordshire). 
William III, son of William II, married Maud, daughter of Gilbert (Hamon) Peche.
 Maud was niece of  Robert Fitzwalter, a leader of the Magna Carta barons. 
Hawise, daughter of William III, was placed as ward with
Hubert de Burgh . Hubert married Hawise to his son, John.  
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