Guillaume was the son of Robert II de Montgommery and Agnès de Ponthieu. The date and place of his birth have not been found.
He died on 29 JUN 1171 in Abbaye de Perseigne, Neufchâtel-en-Saosnois, Sarthe, Pays de la Loire, France .
His wife was Adélaïde de Bourgogne Duché, who he married in ABT 1112. The place has not been found. Their eight known children were Guy II (c1118-1147), Hélie (1120-1174), Jean I (?-1191), Clémence (?-<1189), Guillaume (?-<1171), Robert (?-?), Enguerrand (?-?) and Mabile (?-?).
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Guillaume de Ponthieu |
Robert II de Montgommery |
Roger II de Montgommery |
Roger I de Montgommery |
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Mabile Talvas de Bellême |
Guillaume II de Bellême |
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Hildeburge |
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Agnès de Ponthieu |
Guy I de Ponthieu |
Hugues II de Ponthieu |
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Berthe d'Aumale |
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Ade d'Amiens |
Drogon I d'Amiens |
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| Event | Date | Details | Source | Multimedia | Notes | ||
|---|---|---|---|---|---|---|---|
| Death | 29 JUN 1171 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | FROM 1110 TO 1126 | I comte de Ponthieu | ||||
| Nobility Title | FROM 1119 TO 1171 | III sire d'Alençon et de Séez |