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The Roman Empire in AD 116

An empire is a set of lands or regions that are ruled by an emperor. Usually the emperor will have governors, viceroys or client kings who each rule one land or region. An empire will usually also have many different cultures.

Well-known empires include the Persian Empire, the Roman Empire, the Russian Empire, the Ottoman Empire, and the British Empire.

Today the only monarch to use the title "emperor" is the Emperor of Japan, although his power is mostly ceremonial.