Source note

VERGNIAUD (Louis), who made the Egyptian campaign with Hyacinthe Chabert and Luigi Porta, was quartermaster of hussars when he left the service. During the Restoration he was, in turn, cow-keeper on the rue du Petit-Banquier, keeper of a livery-stable, and cabman. As cow-keeper, Vergniaud, having a wife and three sons, being in debt to Grados, and giving too generously to Chabert, ended in insolvency; even then he aided Luigi Porta, again in trouble, and was his witness when that Corsican married Mademoiselle di Piombo. Louis Vergniaud, being a party to the conspiracies against Louis XVIII., was imprisoned for his share in these crimes. [Colonel Chabert. The Vendetta.]