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.[2] Her dowry consisted of Somerset Manor of Woodspring.[1]
Geva's first husband was "Martin" (died before 1086) for whom she produced a son and heir, Robert fitz Martin (died 1159), who with his descendants were feudal barons of Blagdon.
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.
Keats-Rohan, K. S. B. (2002). Domesday Descendants: A Prosopography of Persons Occurring in English Documents, 1066–1166: Pipe Rolls to Cartae Baronum. Ipswich, UK: Boydell Press. ISBN0-85115-863-3.
Thorn, Caroline & Frank, Domesday Book, Vol. 9, Devon, vol. 1, Chichester, 1985, Chapter 20, holdings of William de Falaise.
Sanders, Ivor J., 'Barony of Blagdon' in English Baronies (Oxford, 1960), p. 15,
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