He was elected to the Legislative Assembly of the Province of Canada for Nicolet in 1844. Méthot died at Saint-Pierre-les-Becquets in 1871.
He was born Antoine-Prosper Méthotte at Pointe-aux-Trembles, Lower Canada in 1804. Méthot studied at the Petit Séminaire de Québec, apprenticed as a notary, received his commission in 1829 and set up practice at Saint-Pierre-les-Becquets.