Facts:   - death place: château de l'hermine    - succession: duke of brittany ; count of montfort    - reign: 29 august 1442 -- 18 july 1450    - successor: peter ii    - spouse: yolande of anjou isabella of scotland    - predecessor: john vi    - mother: joan of france    - death date: 17 july 1450    - house: house of montfort      - father: john vi    - birth date: 11 may 1414    - issue: renaud brittany marie , viscountess of rohan , count of montfort margaret , duchess of    - image: franta1.jpg    - birth place: vannes    - religion: roman catholicism   Based on these bullet points, write a short biography describing the life of francis i , duke of brittany .
francis i -lrb- in breton fransez i , in french françois i -rrb- -lrb- vannes/gwened , 14 may 1414 -- 18 july 1450 , château de l'hermine / kastell an erminig -rrb- , was duke of brittany , count of montfort and titular earl of richmond , from 1442 to his death .he was son of duke john vi and joan of france .