Gilles de Rais, Baron de Rais (French: [ʒil də ʁɛ]; also spelled "Retz"; c. 1405 – 26 October 1440) was a French knight and lord from Brittany, Anjou and Poitou, a leader in the French army during the Hundred Years' War, and a companion-in-arms of Joan of Arc. He remains chiefly known for his conviction on charges of the rape and murder of several children.
An important lord as heir to some great noble lineages of western France, he rallied to the cause of King Charles VII of France and waged war against the English. In 1429, he formed an alliance with his cousin Georges de La Trémoille, the prominent Grand Chamberlain of France, and was appointed Marshal of France the same year, after the successful military campaigns alongside Joan of Arc. Little is known about his relationship with her, unlike the privileged association between the two comrades in arms portrayed by various fictions. He gradually withdrew from the war during the 1430s. His family accused him of squandering his patrimony by selling off his lands to the highest bidder to offset his lavish expenses, a profligacy that led to his being placed under interdict by Charles VII in July 1435. He assaulted a high-ranking cleric in the church of Saint-Étienne-de-Mer-Morte before seizing the local castle in May 1440, thereby violating ecclesiastical immunities and undermining the majesty of his suzerain, John V, Duke of Brittany. Arrested on 15 September 1440 at his castle in Machecoul, he was brought to the Duchy of Brittany, an independent principality where he was tried in October 1440 by an ecclesiastical court assisted by the Inquisition for heresy, sodomy and the murder of "one hundred and forty or more children." At the same time, he was tried and condemned by the secular judges of the ducal court of justice to be hanged and burned at the stake for his act of force at Saint-Étienne-de-Mer-Morte, as well as for crimes committed against "several small children." On 26 October 1440, he was sent to the scaffold with two of his servants convicted of murder.