William de Lanvallei
William de Lanvallei III 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.Family
William III's grandfather, William I, 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.
William II, son of William I, married Hawise, great-granddaughter of Hugh de Bocland.
William III, son of William II, married Maud, daughter of Gilbert 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.
