He is named as the nephew of Comte Louis in a charter of Saint-Savin, son of his brother (who is not named).
He succeeded his uncle in [1000] as Comte de Bigorre. "Garcias Arnaldi comes Vigorrensis…Centullus Gastonis vicecomes Bearnensis…Bernardus comes Armaniacensis, Aymericus comes Fedenciacensis, Bernardus comes Pardiniacensis…Forto vicecomes Levitanensis et filii eius Garcias et Guilhermus, Guilhermus Dati vicecomes Sylvanensis, et Guilhermus Odonis vicecomes de Montanerii, Raimundus Guilhermi de Benaco, et Arnaldus Raymundi de Baso, Guilhermus Garcias Curta spata, Arnaldus cognomine Ursus, Guilhermus Lupi vicecomes Marcianensis, et Arnaldus vicecomes Aquensis…" are named as present in the charter dated to [1022] under which "Sancius…totius Gasconniæ princeps et dux" founded the monastery of St Hilaire-de-Lassun, later known as St Pé-de-Générès. 1
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