Guillaume was the son of Amédée II de Genève and Agnès de Châlon. The date and place of his birth have not been found.
He died on 25 NOV 1320. The place is not known.
His wife was Agnès de Savoie, who he married in 1297. The place has not been found. Their only known child was Amédée III (c1300-1367).
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Guillaume III de Genève |
Amédée II de Genève |
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Agnès de Châlon |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | 25 NOV 1320 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | FROM 1308 TO 1320 | comte de Genève |