The 13th century saw the beginning of the decline of the Pouancé family.Halbert (2000), p. 25 Geoffroy II, the son of Guillaume III, died around 1244. His own son, Geoffroy III, died in 1263, leaving his daughter Jeanne the only heir. She married Jean of Beaumont. Their grandson, Jean II of Beaumont, failed to produce an heir with his first wife Isabeau of Harcourt, and subsequently married Marguerite of Poitiers. Louis of Beaumont, their only son, died in 1364 during the battle of Cocherel.Racineux (1983), p. 41 Marie Chamaillard, the granddaughter of Isabeau (the first wife of Jean II) regained the seigneury of Pouancé, adding it to the fiefs already owned by her husband, Pierre II of Alençon.
