Sir Robert Adair, a British diplomatist, born in London, May 24, 1763, died Oct. 3, 1855. His father, Robert Adair, was sergeant-surgeon to George III. He was distantly related to Charles James Fox, and was early destined for a political career. He entered parliament in 1802, and was a strenuous supporter of whig politics. In 1806 Mr. Fox sent him as ambassador to Vienna, and in 1808 Mr. Canning, although opposed to him in politics, sent him on a special mission to Turkey, where he negotiated the treaty of the Dardanelles, concluded in 1809. He remained at Constantinople till 1811, having been appointed ambassador in 1809. . Sir Robert Adair afterward remained out of office till 1831, when Lord Grey sent him to Belgium, soon after the erection of that country into a kingdom, and he was prominent in negotiating peace. He retired from this mission with the rank of privy councillor in 1835. He left memoirs of his residence at St. Petersburg and Vienna, written at the age of 82.