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, John 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.

Marie of Brittany was born to John IV, Duke of Brittany, and Joan of Navarre on 18 February 1391 in Nantes. She was the fourth child of nine, and the second child to survive to adulthood. In the first four years of her life, Marie was offered as a possible wife for Henry Bolingbroke, the future Henry IV of England, but negotiations fell through when her father instead married her to John I d’Alençon in 1396. Instead, after the death of John IV of Brittany, Marie's mother Joan would marry Henry IV of England.

On 26 June 1396, John IV of Brittany signed a contract with Pierre of Alençon and Perche which wedded Marie of Brittany to John of Perche, Pierre's son. The wedding was celebrated in July of that year at Saint-Aubin-du-Cormier, Ille-et-Vilaine, near Fougères. Marie's dowry was to be 100,000 francs, but her father never paid the entire amount, creating tension between the duchies of Brittany and Alençon in later years. In 1404, John succeeded his father as the Count of Alençon and Perche.

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