Irmgard was born about 1373, the daughter of Johann II von Diepholz and Kunigunde von Oldenburg-Oldenburg. The place is not known.
She died on 24 MAR 1426. The place is not known.
Her husband was Konrad IV von Rietberg, who she married on 24 APR 1399. The place has not been found. Their three known children were Adelheid (c1406-1436), Konrad V (c1412-1472) and Johann (?-?).
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Irmgard von Diepholz |
Johann II von Diepholz |
Konrad VI von Diepholz |
Rudolf III von Diepholz |
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Jutta von Oldenburg-Delmenhorst |
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Armgard von Waldeck |
Heinrich II (IV) von Waldeck |
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Adelheid van Kleef |
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Kunigunde von Oldenburg-Oldenburg |
Konrad II von Oldenburg-Oldenburg |
Konrad I von Oldenburg |
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Ingeborg von Holstein-Plön |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Birth | ABT 1373 |
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| Death | 24 MAR 1426 |
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