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Marguerite Montford de Bretagne was born 1392 to Jean IV de Bretagne (1339-1399) and Joanna of Navarre (1370-1437) and died 13 April 1446 Blain of unspecified causes. She married Alain IX de Rohan (c1381-1462) 26 June 1407 JL .
Children
| Name | Birth | Death | Joined with |
| Alain de Rohan (1408-1449) | |||
| Béatrix de Rohan (-1418) | |||
| Marguerite de Rohan (c1412-1497) | 1412 | 1497 | Jean of Angoulême (c1399-1467) |
| Jeanne de Rohan (1415-aft1459) | |||
| Catherine de Rohan (c1425-aft1471) | 1425 | 1471 | Jacques de Dinan (-1444) Jean of Albret (1420-1468) |