Guillaume was the son of Sanche I d'Astarac but his mother is unknown. The date and place of his birth have not been found.
He died before 1124. The place is not known.
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Guillaume II d'Astarac |
Sanche I d'Astarac |
Guillaume I d'Astarac |
Arnaud II d'Astarac |
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Atalese |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | BEF 1124 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | comte d'Astarac |