Willem was the son of Willem III van Horne and Margaretha van Loon-Chiney. The date and place of his birth have not been found.
He died before 27 MAR 1301. The place is not known.
His wife was Sophie van Heusden, who he married in BEF 1294. The place has not been found. They had no known children.
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Willem IV van Horne |
Willem III van Horne |
Willem II van Horne |
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Heilwig von Altena |
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Margaretha van Loon-Chiney |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | BEF 27 MAR 1301 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | heer van Hoorne |
| Association | Relationship |
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| Agnes van Perwijs | mother? |