Guillaume was born about 1010, the son of Arnaud II d'Astarac and Atalese. The place is not known.
He died after 1060. The place is not known.
His wife is not known. They were married, but the date and place have not been found. Their only known child was Sanche I (c1045->1099).
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Guillaume I d'Astarac |
Arnaud II d'Astarac |
Garcie-Arnaud I d'Aure |
Arnaldo I Aznárez d'Aure |
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Fachilène d'Astarac |
Arnaldo Garcés |
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Atalese |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1010 |
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| Death | AFT 1060 |
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