Antoine Francois Derues was born at Chartres in 1744; his father was a corn merchant. His parents died when he was three years old. For some time after his birth he was assumed to be a girl; it was not until he was twelve years old that an operation determined his sex to be masculine. Apprenticed by his relatives to a grocer, Derues succeeded so well in the business that he was able in 1770 to set up on his own account in Paris, and in 1772 he married. Among the grocer's many friends and acquaintances this marriage created something of a sensation, for Derues let it be known that the lady of his choice was of noble birth and an heiress. The first statement was untrue. The lady was one Marie Louise Nicolais, daughter of a non-commissioned artillery officer, turned coachbuilder. But by suppressing the S at the end of her name, which Derues was careful also to erase in his marriage contract, the ambitious grocer was able to describe his wife as connected with the noble house of Nicolai, one of the most distinguished of the great French families. There was more truth in the statement that Mme. Derues was an heiress. A kinsman of her mother, Beraud by name, had become the heir to a certain Marquis Desprez. Beraud was the son of a small merchant. His mother had married a second time, the husband being the Marquis Desprez, and through her Beraud had inherited the Marquis' property. According to the custom of the time, Beraud, on coming into his inheritance, took a title from one of his estates and called himself thenceforth the lord of Despeignes-Duplessis. A rude, solitary, brutal man, devoted to sport, he lived alone in his castle of Candeville, hated by his neighbours, a terror to poachers. One day he was found lying dead in his bedroom; he had been shot in the chest; the assassin had escaped through an open window.