Jean I de Bretagne Comte
| Birth* | Jean I de Bretagne Comte was born at France. |
| Christening | He was christened at France. |
| Marriage* | He married Blanche de Champagne, daughter of Thibault VI de Champagne roi de Navarre and Agnès de Beaujeu, on 16 January 1236 at France. |
| Death* | Jean I de Bretagne Comte died at France. |
| Burial* | He was buried at France. |
Family | Blanche de Champagne |
| Child |