Arnaud was the son of Sanche I d'Astarac but his mother is unknown. The date and place of his birth have not been found.
Arnaud d'Astarac
Sanche I d'Astarac (c1045->1099)
Guillaume I d'Astarac (c1010->1060)
Arnaud II d'Astarac (c0960-1022/23)
Atalese (c0975-?)