Biography
Guy XII de Montmorency-Laval, seigneur de Laval, vicomte de Rennes, baron de Vitré, seigneur de Gavre, seigneur d'Acquigny, châtelain du Désert, gouverneur de Bretagne, was born after 1327 to Guy X de Montmorency-Laval (c1300-1347) and Béatrix de Bretagne (1295-1384) and died 24 April 1414 of unspecified causes. He married Louise de Châteaubriant (-1383) 1348 JL . He married Jeanne de Laval-Tinténiac (-1437) 28 May 1384 JL .
Children
| Name | Birth | Death | Joined with |
| Anne de Montmorency-Laval (1385-1466) | 1385 | 28 January 1466 | Jean de Montfort (1385-1414) |
| Guy de Montmorency-Laval (-1404) | |||
Footnotes (including sources)
| ‡ General |