Jadran is a sailing ship for basic naval training built between 1930 and 1933 for the Yugoslav Royal Navy and currently in Montenegrin Navy service. A three-mast topsail schooner or barquentine with an auxiliary engine, "Jadran" was built in Hamburg, Germany, and commissioned on 19 August 1933. Prior to World War II she completed seven long training cruises with trainees from the Yugoslav Naval Academy, including one to North America. After the outbreak of World War II, Yugoslavia was neutral, and short cruises were conducted in the Adriatic Sea. In April 1941, Yugoslavia was invaded by the Axis powers, and "Jadran" was captured by the Italians who renamed her Marco Polo. She continued to be used as training ship, operating out of Pola in Istria to cruise in the Adriatic, and was featured in an Italian propaganda film.