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An emperor is a male who rules an empire. An emperor usually comes to power when one of his parents, or relatives, dies. In some countries, people elected a new emperor from candidates. The wife of an emperor is called an empress. A woman who comes to power in an empire is also called an empress, for example Catherine the Great.
- In the past
The English word comes from Latin, the language of the old Roman Empire. At first, an imperator was a powerful general (army leader) but, after Augustus, it was only used by their most powerful rulers. There have been many countries in history whose leaders are called "emperor" in English. The leaders of the Byzantine Empire (basileus, autokrator) in Greece, the Holy Roman Empire (imperator, Kaiser) in Germany, and the Ottoman Empire (sultan, padishah, khagan, kaysar) in Turkey all said they were just new parts of the old Roman Empire.
The leaders of other countries who said they ruled the whole world or called themselves "king of kings" are frequently also called emperors in English. For example, the old rulers of China (huangdi), Russia (tsar), and Ethiopia (negusa negast) are all known as emperors in English. There have also been emperors of France, Germany, and Mexico and the rulers of the United Kingdom called themselves the emperors and empresses of India for a while.