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Richard of Brittany (1395 – 2 June 1438, Château de Clisson), Count of Benon, Étampes, and Mantes, married in 1423 Margaret d'Orléans, Countess of Vertus, daughter of Louis of Valois, Duke of Orléans
On 27 June 1474, at Clisson, she married Francis II, Duke of Brittany (1435–1488), son of Richard of Brittany (1395–1438), Count of Étampes (1421–1438), and of Margaret d'Orléans (1406–1466), Countess of Vertus (b. 1423).
Margaret, Countess of Vertus (1406–1466), married Richard of Brittany, Count of Étampes