| Jean de Dunois | |
| Count of Dunois Count of Longueville | |
| Birth Date: | 23 November 1402 |
| Birth Place: | France |
| Issue: | François Ι d'Orléans-Longueville |
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| Issue-Pipe: | Among others… |
| Father: | Louis I, Duke of Orléans |
| Mother: | Mariette d'Enghien |
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Jean d'Orléans, Count of Dunois (23 November 1402 – 24 November 1468), known as the "Bastard of Orléans" (French: bâtard d'Orléans) or simply Jean de Dunois, was a French military leader during the Hundred Years' War who participated in military campaigns with Joan of Arc. His nickname, the "Bastard of Orléans", was a mark of his high status, since it acknowledged him as a first cousin to the king and acting head of a cadet branch of the royal family during his half-brother's captivity. In 1439 he received the county of Dunois from his half-brother Charles, Duke of Orléans, and later King Charles VII made him count of Longueville.
Jean was the illegitimate son of Louis I, Duke of Orléans – son of King Charles V of France – and his mistress Mariette d'Enghien. In 1407, Jean's father, Louis I, Duke of Orléans was assassinated. Eight years later, his half-brother, Charles, Duke of Orléans was captured at the Battle of Agincourt. He remained a prisoner of the English for twenty-five years. This left Jean the only adult male to represent the house of Orléans. He was Knight of the Order of the Porcupine.
Jean took part in the civil war in France during the reign of Charles VI on the side of the Armagnacs, and was captured by the Burgundians in 1418. Released in 1420, he entered the service of the Dauphin Charles, fighting in the Hundred Years' War against English forces. In 1427, Jean, along with Arthur of Richemont and Etienne of Vignolles, forced the Earl of Warwick to raise his siege of Montargis. He was wounded, the next year, at the battle of Rouvray. Jean led the French defenses at the siege of Orléans, and together with Joan of Arc relieved the siege. He joined her on the campaigns of 1429 and remained active after her death.
Jean attended Charles VII's coronation in July 1429 and in 1436 aided in the recapture of Paris. In 1439 he was made Count of Dunois. He was prominent in the conquest of Guienne and Normandy in the final years of the Hundred Years War.
Jean participated in the Praguerie revolt against Charles VII and was a leader of the League of the Public Weal against King Louis XI in 1465, but each time he regained favor at court.
He married Marie Louvet (d. 1426) in April 1422 at Bourges, by whom he had no children.
He married a second time to Marie of Harcourt (d. 1464), Lady of Parthenay 26 October 1439 and had four children:
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