Johann was the son of Johann II von Heydeck and Agnes von Waldburg. The date and place of his birth have not been found.
He died before 1464. The place is not known.
His wife was Elisabeth von Sickingen. They were married, but the date and place have not been found. Their only known child was Johann VI (III) (?-?).
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Johann III von Heydeck |
Johann II von Heydeck |
Friedrich II von Heydeck |
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Adelheid von Henneberg |
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Beatrix von Teck |
Friedrich III von Teck |
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Anna von Helfenstein-Blaubeuren |
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Agnes von Waldburg |
Johann II von Waldburg |
Eberhard III von Waldburg |
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Agnes von Teck |
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Ursula von Abensberg |
Johann II von Abensberg |
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Agnes von Liechtenstein |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | BEF 1464 |
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