In 1807, Canning was given a minor role in the Foreign Office by his cousin (as deputy to Col. Norton Powlett,
Clerk of the Signet), and was sent with
Anthony Merry on a mission to
Denmark later that year. His first trip to
Constantinople came in 1808, when he accompanied the mission of
Robert Adair that restored peace between Britain and the Turks. When Adair left Constantinople in 1810, Canning became
Minister Plenipotentiary, and it was Canning who helped mediate the
Treaty of Bucharest between the Ottomans and Russia on 28 May 1812. Canning returned to London later that year, and helped to found the
Quarterly Review. In June 1814 he was appointed
Envoy Extraordinary and Minister-Plenipotentiary to Switzerland, where he, along with the other allied representatives, helped negotiate Swiss neutrality and a
new Swiss federal constitution. In October he went to
Vienna, where he acted as an aid to
Lord Castlereagh, the British representative at the
Congress of Vienna. After the negotiation of Swiss neutrality in 1815, Canning's role there became dull to him, but he stayed until 1819, when he was recalled and sent to
Washington as
Envoy Extraordinary and Minister-Plenipotentiary to the United States. Although he hoped for major accomplishments in Washington that would allow him to move up to a larger position, he was largely unsuccessful. The initiative of his cousin George, this time as Foreign Secretary, for a joint Anglo-American guarantee of Latin American independence, led to the promulgation of the
Monroe Doctrine. In 1820 Canning was made a member of the
Privy Council. Canning returned to London in 1823, and the next year was sent on a mission to
Russia, where he negotiated a treaty on the border between Russian and British North America, but failed to come to any agreement regarding the Greek Revolt. Later in February 1825 he concluded a treaty with Russia on the north-west American frontier (the
treaty of Saint Petersburg). In 1825, Canning was returned to Constantinople, this time as
Ambassador. He fled the city following the
Battle of Navarino in 1827, but after a brief return to London he, along with the French and Russian ambassadors who had also fled, set up camp at
Poros. In 1828 he and the other ambassadors participated in the
Conference of Poros, which recommended to their respective governments the establishment of a separate Greek state, including the islands of
Crete,
Samos, and
Euboea. Although he had been encouraged in this generous position towards the Greeks by his superior,
Lord Aberdeen, this move was disavowed by the government, and Canning resigned. ==Diplomatic career, 1831–1841==