Willem was born about 1240, the son of Willem II van Horne and Heilwig von Altena. The place is not known.
He died in 1304 in Zierikzee, Zeeland.
He had two marriages/partners. His first wife was Margaretha van Loon-Chiney. They were married, but the date and place have not been found. Their two known children were Willem IV (?-<1301) and Gerard I (c1270-<1331).
His second wife was Agnes van Perwijs. They were married, but the date and place have not been found. They had no known children.
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Willem III van Horne |
Willem II van Horne |
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Heilwig von Altena |
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| Event | Date | Details | Source | Multimedia | Notes | ||
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| Birth | ABT 1240 |
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| Death | 1304 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | heer van Horne en Altena |