Étienne was the son of Étienne II de Blois and Agnès de Montreuil-Bellay. The date and place of his birth have not been found.
He died before 1303. The place is not known.
His wife was Péronelle de Milly. They were married, but the date and place have not been found. Their two known children were Marguerite (?-?) and Jeanne (?-c1313).
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Étienne III de Sancerre |
Étienne II de Blois |
Étienne I de Blois |
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Alix de Donzy |
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Agnès de Montreuil-Bellay |
Giraut III de Montreuil-Bellay |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | BEF 1303 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de Saint-Brisson, de Châtillon-sur-Loing, de Saint Maucerre et de Marcheville |