Sébastiani recognized the Bourbon Restoration, but rallied with Napoleon during the Hundred Days, being elected to the Chamber for the first time in 1815. Briefly exiled after the return of King Louis XVIII, he was again admitted as a Deputy in 1819, sitting with the Left faction, supporting liberal politics, and coming into conflict with the Jean-Baptiste de Villèle Cabinet. After the July Revolution, he endorsed Louis-Philippe. Sébastiani's time as Foreign Minister saw France's involvement in the Belgian Revolution, its refusal to sanction the November Uprising, the controversial solution to a commercial dispute with the United States, and the French occupation of Ancona. In later years, he progressed in French Government service as an ambassador.