Entered political life as a member of the Irish Parliament, co-operated with Pitt in securing the Union, after which he entered the Imperial Parliament, became War Minister, till the ill-fated Walcheren expedition and a duel with Canning obliged him to resign; be came Foreign Secretary in 1812, and the soul of the coalition against Napoleon; represented the country in a congress after Napoleon's fall; succeeded his father as Marquis of Londonderry in 1821, and committed suicide the year following; his name has been unduly defamed, and his services to the country as a diplomatist have been entirely overlooked (1769-1822).