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Joan of Valois (c. 1294 Longpont, Aisne, France – 7 March 1342, Fontenelle, Yonne, France) was the second eldest daughter of the French prince Charles of Valois and his first wife, Margaret, Countess of Anjou (1274–1299). As the sister of King Philip VI of France and the mother-in-law of Edward III, she was ideally placed to act as mediator between them.
Her paternal grandparents were Philip III of France and Isabella of Aragon. Her maternal grandparents were Charles II of Naples and Maria Arpad of Hungary. Joan was one of six children. In 1299, Joan's mother died, probably in childbirth and herfather married his second wife, Catherine I of Courtenay, Titular Empress of Constantinople (1274–1308, by whom he had four more children. He would marry his third wife Mahaut of Châtillon in 1308 and by her he would sire a son and three daughters, among them were Isabella of Valois, who became Duchess of Bourbon and Blanche of Valois, who married Charles IV, Holy Roman Emperor.
Joan married William III, Count of Holland and Hainaut on 23 May 1305. She was a supporter of her cousin Isabella of France in her struggle against Edward II. This brought about an alliance between Hainaut and Isabella and the English exiles, who were in opposition to the English king and his favorite, Hugh Despenser the Younger. Isabella's son got engaged to Joan's daughter Philippa and Isabella raised an army in their lands. It was also from there that Isabella and her lover Roger Mortimer began their invasion of England.[1]
In 1332, after Philippa had become queen, she arranged the wedding between Isabella's daughter Eleanor with Reginald II, Duke of Guelders and she visited her daughter Philippa in England.
After her husband died in 1337, she took the veil and became Abbess at the Royal Abbey of Fontevraud. In 1340, her son-in-law dealt her brother Philip a heavy blow by defeating him at sea near Sluys. Edward then went on to besiege Tournai, but was beset by financial problems. Pope Benedict XII then asked Joan to mediate. She first went to her brother, whom she had begged for peace. Then she went to Edward in his tent and begged him for peace as well. The pleas of their relative Joan, sent by the pope, allowed the two men to sign a truce without loss of face.
Joan's children with William III
William IV of Hainaut (1307–1345)
John (died 1316)
Margaret II, Countess of Hainaut (1311–1356), married Louis IV, Holy Roman Emperor
Philippa of Hainault (24 June 1314–1369), married king Edward III of England
Agnes (died 1327)
Joanna of Hainaut (1315–1374), married William V, Duke of Jülich
Isabella of Hainaut (1323–1361), married Robert of Namur
Louis (1325–1328)
Thomas Wolfgang
Ackermann
