Guillaume was the son of Guillaume I de Derval but his mother is unknown. The date and place of his birth have not been found.
His wife was Anne de Rostrenen, who he married in AFT 1203. The place has not been found. Their two known children were Guillaume III (?-?) and Méen (?-?).
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | seigneur de Derval |