Julie d'Aubigny (1670/1673–1707), better known as Mademoiselle Maupin or La Maupin, was a 17th-century swordswoman and opera singer. Her tumultuous career and flamboyant life were the subject of gossip and colourful stories in her own time, and inspired numerous portrayals afterwards. Théophile Gautier loosely based the title character, Madeleine de Maupin, of his novel Mademoiselle de Maupin (1835) on her.
Julie d'Aubigny was born in 1673 to Gaston d'Aubigny, a secretary to Louis de Lorraine-Guise, comte d'Armagnac, the Master of the Horse for King Louis XIV. Her father trained the court pages, and so his daughter learned dancing, reading, drawing, and fencing alongside the pages, and dressed as a boy from an early age. By the age of fourteen, she became a mistress of the Count d'Armagnac who had her married to Sieur de Maupin of Saint-Germain-en-Laye. Soon after the wedding, her husband received an administrative position in the south of France, but she stayed in Paris.
Around 1687, Madame de Maupin became involved with an assistant fencing master named Sérannes. When Lieutenant-General of Police Gabriel Nicolas de la Reynie tried to apprehend Sérannes for killing a man in an illegal duel, the pair fled the city to Marseille.
On the road south, Madame de Maupin and Sérannes made a living by giving fencing exhibitions and singing in taverns and at local fairs. While travelling and performing in these impromptu shows, Maupin dressed in male clothing but did not conceal her gender. On arrival in Marseille, she joined the opera company run by Pierre Gaultier, singing under her maiden name.
Eventually, she grew bored of Sérannes and became involved with a young woman. When the girl's parents put her away in the Visitandines convent in Avignon, Maupin followed, entering the convent as a postulant. In order to run away with her new love, she stole the body of a dead nun, placed it in the bed of her lover, and set the room on fire to cover their escape. Their affair lasted for three months before the young lady returned to her family. Maupin was charged in absentia—as a male—with kidnapping, body snatching, arson, and failing to appear before the tribunal. The sentence was death by fire.