Guillaume was the son of Bonabes II de Derval but his mother is unknown. The date and place of his birth have not been found.
He died in 1275. The place is not known.
His wife was Anne de Rochefort. They were married, but the date and place have not been found. Their two known children were Agnès (c1250-1275) and Bonabes (?-<1275).
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Guillaume IV de Derval |
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Anne de Rostrenen |
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Geoffroy VI de Châteaubriant |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | 1275 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de Derval |