Lauriston was held as a prisoner of war until the fall of the empire. He then joined King Louis XVIII of France, to whom he remained faithful during the Hundred Days. His reward was a seat in the Chamber of Peers and a command in the Royal Guard. In 1817, he was created a marquis, and became commandant "supérieur" of the "Département du Finistère et de la place de Brest". In 1823, Lauriston was made a Marshal of France and he commanded a corps during the Spanish expedition. He died of a stroke in Paris on 11 June 1828. The name is inscribed on Column 13 of the Arc de Triomphe.