Marie Chamaillart, Viscountess of Beaumont-au-Maine
Born: 1345
Died: November 18, 1425 (age 80 years)
Parents: Guillaume II Chamaillard and Marie de Beaumont-Brienne
Children: John I, Duke of Alençon, Pierre d'Alençon, Marguerite d'Alençon, and more
Grandchild: John II, Duke of Alençon
Partner: Peter II, Count of Alençon (1371–)