William de Lanvallei
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).
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