Biography
Marie de Bretagne, Dame de La Guerche, was born 18 February 1391 in Nantes to Jean IV de Bretagne (1339-1399) and Joanna of Navarre (1370-1437) and died 18 December 1446 of unspecified causes. She married Jean I d'Alençon (1385-1415) 26 June 1396 JL .
Children
| Name | Birth | Death | Joined with |
| Pierre d'Alençon (1407-1408) | |||
| Jean II d'Alençon (1409-1476) | 2 March 1409 Argentan, Orne, France | 8 September 1476 Paris, France | Jeanne d'Orléans (1409-1432) Marie d'Armagnac (1420-1473) |
| Marie d'Alençon (1410-1412) | |||
| Jeanne d'Alençon (1412-1420) | |||
| Charlotte d'Alençon (1413-1435) | |||