The Genealogica Comitum Guasconiæ names "Sancium-Garsiam et Willelmum-Garsiam et Arnaldum-Garsiam" as the three sons of "Garsiam-Sancium Corvum", specifying that they divided Gascony between them, Guillaume Garcia receiving "Fidenciacum". The Codex de Roda names "Sanzio Garsias et Arnaldo Garsies ac Gilelmo Garsies, ac domna Andregoto, seu domna Acibella, seu et ---" as the children of "Garsea Sanzoz" and his unnamed wife. The cartulary of Auch records that "Garsiam Sancium Curvum" had three sons "Sancium Garsiam et Guillelmum Garsiam et Arnaldum Garsiam", specifying that Sancho succeeded in Gascony, Guillaume in Fezensac, and Arnaud in Astarac. Monlezun names "Guillaume" as second of the three sons of Garcia, specifying that he succeeded his father in "Fezensac, réuni alors à l'Armagnac". "Guilelmus Garsie comes de Fidentiaco" donated property to Sainte-Marie d’Auch by charter dated May [926], signed by "Oriolo Datus vicecomite…". The name of Guillaume's wife is not known. 1
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