Johan was the son of Hendrik van Gennep and Aleid von Mörs. The date and place of his birth have not been found.
He died before 1361. 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 Johan II (c1320-?).
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Johan I van Gennep |
Hendrik van Gennep |
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Aleid von Mörs |
Dietrich III (II) von Mörs |
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Margarethe von Isenburg-Ahrenfels |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | BEF 1361 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | heer van Gennep |