During the Mediterranean expedition of 1799, Fyodor Ushakov single-handedly carved out the Greek Republic of Seven Islands, proceeding to clear from the French Corfu and all the Ionian islands. His squadron then blocked the French bases in Italy, notably Genoa and Ancona, and successfully assaulted Naples and Rome. Ushakov, proclaimed a patron saint of the Russian Navy in the 21st century, was succeeded in command by Dmitriy Senyavin who reasserted Russian control of the southern Adriatic, disrupted Dubrovnik's sea trade, and destroyed the Ottoman Fleet in the Battle of Athos (1807). Between 1803 and 1855, Russian sailors undertook over 40 circumnavigations and distant voyages, which played an important role in exploration of the Far East and culminated in Fabian Gottlieb von Bellingshausen's discovery of Antarctica.