Gian Galeazzo Ciano, 2nd Count of Cortellazzo and Buccari (ˈtʃɑːnoʊ , ɡaleˈattso ˈtʃaːno; 18 March 1903 – 11 January 1944) was an Italian diplomat and politician who served as Foreign Minister in the government of his father-in-law, Benito Mussolini, from 1936 until 1943. During this period, he was widely seen as Mussolini's most probable successor as head of government.
He was the son of Admiral Costanzo Ciano, a founding member of the National Fascist Party; father and son both took part in Mussolini's March on Rome in 1922. Ciano saw action in the Italo-Ethiopian War (1935–36) and was appointed Foreign Minister on his return. Following a series of Axis defeats in the Second World War, Ciano began pushing for Italy's exit, and he was dismissed from his post as a result. He then served as ambassador to the Vatican.
In July 1943, Ciano was among the members of the Grand Council of Fascism that forced Mussolini's ousting and subsequent arrest. Ciano proceeded to flee to Germany but wa