He was born at Montaigu (Vendée), the son of J. B. de la Révellière. He adopted the name Lépeaux from a small property belonging to his family, and he was known locally as M. de Lépeaux. He studied law at Angers and Paris, being called to the bar in 1775. A deputy to the Estates-General of 1789, he returned at the close of the session to Angers, where with his school-friends J. B. Leclerc and Urbain-René Pilastre he sat on the council of Maine-et-Loire, and had to deal with the first Vendéen outbreaks. In 1792 he was returned by the "département" to the Convention, and on 19 November he proposed the famous decree by which France offered protection to foreign nations in their struggle for liberty.