Wilhelm was the son of Heinrich III von Montfort-Tettnang and Adelheid von Habsburg-Laufenburg. The date and place of his birth have not been found.
He died about 1439. The place is not known.
His wife was Kunigunde von Werdenberg-Heiligenberg-Bludenz. They were married, but the date and place have not been found. Their five known children were Klara (c1421-?), Hugo XIII (XII, XI) (c1439-1491), Ulrich V (IV) (1440-1495), Heinrich VI (?-1444) and Kunigunde (?->1463).
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Wilhelm IV (V) von Montfort-Tettnang |
Heinrich III von Montfort-Tettnang |
Wilhelm II von Montfort-Bregenz |
Hugo III von Montfort-Tettnang |
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Margareta von Gundelfingen-Hellenstein |
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Kunigunde von Rappoltstein |
Heinrich III von Rappoltstein |
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Susanna von Geroldseck |
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Adelheid von Habsburg-Laufenburg |
Johann I von Habsburg-Laufenburg |
Rudolf III von Habsburg-Laufenburg |
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Elisabeth von Rapperswil |
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Agnes von Werd-Erstein |
Sigismund von Werd-Elsaß |
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Adélaïde de Blâmont |
| Event | Date | Details | Source | Multimedia | Notes |
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| Death | ABT 1439 |
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