Qui es va casar amb Marie of Brittany, Lady of La Guerche?

Marie of Brittany (18 February 1391 – 18 December 1446) was the Countess of Perche and Lady of La-Guerche from 1396 until 1414, and the Countess of Alençon from 1404 until 1414. In 1414, Marie’s titles became Duchess of Alençon, Countess of Perche, Lady of La-Guerche, when Charles VI of France raised her husband John's county of Alençon to a duchy. After the death of her husband in 1415, Marie retained the title of Lady of La-Guerche when her son, Jean II took the titles of Duke of Alençon and Count of Perche. Marie was the link between the House of Montfort of the duchy of Brittany and the ducal House of Valois-Alençon.

Joan III d'Alençon dit «el Savi» a vegades apareix com a Joan I, per ser el primer d'aquest nom que fou duc, (1385 - Azincourt, 1415) fou comte, després duc d'Alençon, comte de Perche i baró de Sainte Suzanne, fill de Pere II d'Alençon i de Maria Chamaillard. Va ser el primer de la nissaga a portar el títol de duc.