John I the Red (in Breton Yann Iañ ar Ruz, in French Jean I le Roux) (1217 – October 8 1286), known as John the Red due to the colour of his beard, was Duke of Brittany, from 1237 to his death. He was son of Duke Peter I and Alix of Thouars, heiress of the duchy. In 1236 John married Princess Blanche, daughter of King Theobald I of Navarre. John was nominal duke from 1221, date of his mother’s death, although his father ruled as regent until he reached adulthood.
See also
| Preceded by Alix Peter I |
Duke of Brittany 1237–1286 |
Succeeded by John II |
| Preceded by Peter of Savoy |
Earl of Richmond 1268 |
Succeeded by John II |
