an empire established by Augustus in 27 BC and divided in AD 395 into the Western Roman Empire and the eastern or Byzantine Empire; at its peak lands in Europe and Africa and Asia were ruled by ancient Rome
a former empire in eastern Europe and northern Asia created in the 14th century with Moscow as the capital; powerful in the 17th and 18th centuries under Peter the Great and Catherine the Great when Saint Petersburg was the capital; overthrown by revolution in 1917
a Turkish sultanate of southwestern Asia and northeastern Africa and southeastern Europe; created by the Ottoman Turks in the 13th century and lasted until the end of World War I; although initially small it expanded until it superseded the Byzantine Empire
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