He became feudal baron of Stogursey in Somerset and also held manors in Devon.
William married Geva de Burci (her second husband), who was the daughter and sole heiress of Serlo de Burcy,[1] feudal baron of Blagdon, Somerset, which barony is sometimes stated to be of Dartington, Devon, as the caput cannot be clearly assigned exclusively to either place.
William's daughter and sole heiress to the feudal barony of Stogursey was Emma of Falaise, who married William de Courcy (died about 1114), to whose descendants the barony of Stogursey passed.
The Devon lands of William of Falaise however passed to the FitzMartin family, feudal barons of Blagdon, who were sometimes seated at his former manor of Dartington.
The Exeter Domesday Book lists him as holding the following 17 Devon manors as a tenant-in-chief of the king:[3] He is listed as Wilts de Faleise, holding 3 Somerset manors as tenant-in-chief:[4]