Guillaume was born after 1175, the son of Étienne I de Blois and Alix de Donzy. The place is not known.
He died in 1217. The place is not known.
He had two marriages/partners. His first wife was Marie de Charenton. They were married, but the date and place have not been found. Their two known children were Béatrice (c1192-1247) and Louis I (c1207-1267).
His second wife was Eustachie de Courtenay, who he married in AFT 1210. The place has not been found. They had no known children.
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Guillaume I de Sancerre |
Étienne I de Blois |
Thibaut de Blois |
Étienne-Henri II de Blois |
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Adèle de Normandie |
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Mechtild von Kärnten |
Engelbert II von Sponheim |
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Uta von Passau |
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Alix de Donzy |
Geoffroy III de Donzy |
Hervé II de Donzy |
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Narjot I de Toucy |
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Ermgarde |
| Event | Date | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|
| Birth | AFT 1175 |
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| Death | 1217 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | seigneur de Saint-Brisson | |||||
| Nobility Title | comte de Sancerre |