The term 'Italian Leader' can be summarized by the word 'DUCE', which is a four-letter Italian word meaning leader. The term was first used in the early 1920s to refer to Benito Mussolini, who was the leader of the National Fascist Party in Italy from 1922 to 1943. He was also the Prime Minister of Italy from 1922 to 1943 and the leader of the Italian Social Republic from 1943 to 1945. Mussolini was known for his authoritarian rule and his aggressive foreign policy, which ultimately led to Italy's involvement in World War II.