Guillaume was born in 1136, the son of unknown parents. The place is not known.
He died in 1164. The place is not known.
His wife was Constance de Bretagne, who he married in ABT 1155. The place has not been found. Their two known children were Adélaïde (>1155-?) and Geoffroi (c1160-c1214).
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Birth | 1136 |
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| Death | 1164 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | comte de Poitou |
Note 1