Thomas was the son of Arnoud VI (V) van Diest and Élisabeth de Mortaigne. The date and place of his birth have not been found.
He died on 08 NOV 1349. The place is not known.
His wife was Marie de Ghistelles. They were married, but the date and place have not been found. Their only known child was Hendrik V (c1345-c1384).
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Thomas I van Diest |
Arnoud VI (V) van Diest |
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Élisabeth de Mortaigne |
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| Event | Date | Details | Source | Multimedia | Notes |
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| Death | 8 NOV 1349 |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | heer van Diest en Zeelem | |||||
| Nobility Title | châtelain d'Anvers |