Jean was the son of unknown parents. The date and place of his birth have not been found.
His wife was Jeanne de Montmorency, who he married in 1336. The place has not been found. They had no known children.
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | seigneur de Rochefort-en-Bretagne |