Pierre was born about 1080, the son of Derrien de Rostrenen but his mother is unknown. The place is not known.
He died after 1135. The place is not known.
His wife is not known. They were married, but the date and place have not been found. Their only known child was Riwallon II (c1120-?).
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Pierre I de Rostrenen |
Derrien de Rostrenen |
Riwallon I de Rostrenen |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1080 |
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| Death | AFT 1135 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | seigneur de Rostrenen |