Sancho I of Astarac dating history

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Sancho I (flourished 1050–1096/1119) was the count of Astarac from around 1060. He was the only son of William I and inherited the entire county of Astarac, which had been reduced in area by partitioning among heirs in earlier generations. Sancho had at least three sons. His eldest, William, is mentioned in a document of about 1075, but died before his father. His second son, Bernard, then became his sole heir, since the youngest son, Odo (fl. 1090–1125), became a monk at Simorre. The only information provided on Sancho by the Genealogia comitum Guasconiae (Genealogy of the Counts of Gascony) in the archives of the cathedral of Sainte-Marie d'Auch is that "William begat Sancho [and] Sancho begat Bernard." Sancho's wife is mentioned in a document from about 1075, but is not named.