Emperor - Wikipedia

An Emperor is nominally a monarch and sovereign ruler of an Empire. Emperors are generally recognized to be above kings in honour. The English term for emperor is derived from the Latin imperator, which is in turn derived from a Latin word meaning "to impose". In German the title kaiser is used and in Russian tsar or czar is used, both of which are derived from Caesar.

Imperator was originally a title used by Roman military comanders, which reflected their right "to impose" punishment on the soldiers under their command. Caesar was the family name of Gaius Julius Caesar (100 BC-44 BC), who never was an emperor himself but rather the last dictator of the Roman republic. The name of Caesar lived on by adoption in the first Roman Emperor, Gaius Julius Caesar Octavianus or Augustus, as he is known as emperor. The style used by the Roman Emperors was primarily that of Augustus, but the names and titles of Caesar and Imperator was also used.

Countries which have been ruled by Emperors or Empresses:

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1 Ancient Empires

2 Medieval Empires

3 Newer Empires

4 Emperors of short-lived "Empires"

5 Self-proclaimed "Emperors"

Ancient Empires

Medieval Empires

Holy Roman Empire (962-1806)
Byzantine Empire (395-1453)
- Latin Empire (1204)
- Empire of Nicea[?] (1261)
Iran (1501-1979)
Mogul Empire (1526-1857)
Ottoman Empire (14th century-1922)

Newer Empires

Austria-Hungary (under the Habsburgs, 1804-1918)
Brazil (Pedro I, 1822-1831 and Pedro II, 1831-1889)
French Empire (Napoleon I, 1804-1814 and Napoleon III, 1852-1870)
German Empire (under the Hohenzollerns, 1871-1918)
India (under the British Raj, 1876 - 1947)
Russian Empire (under the Romanovs, 1721 - 1917)

Emperors of short-lived "Empires"

Emperor Jaques I of Haiti (1804-1806)
Emperor Augustin of Mexico (1822-1823)
Emperor Maximilian of Mexico (1864-1867)
Emperor Bokassa I of the Central African Empire (1976-1979)

Self-proclaimed "Emperors"

Emperor Norton I of the United States (1859-1880)