Jean was the son of Thierry de Saint Omer and Eustache de Wavrin. The date and place of his birth have not been found.
His wife was Jeanne de Poucques. They were married, but the date and place have not been found. Their two known children were Péronne (c1350-?) and Jean (?-1440).
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Robert III de Wavrin |
Robert II de Beaumont-Beaussart |
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| Attribute | Date | Description | Details | Source | Multimedia | Notes |
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| Nobility Title | heer van Moerbeke en Piennes |