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The Khwarazmian Empire (English: / k w ə ˈ r æ z m i ən /), also called the Empire of the Khwarazmshahs or simply Khwarazm, was a culturally Persianate, Sunni Muslim empire of Turkic mamluk origin. Khwarazmians ruled large parts of present-day Central Asia, Afghanistan, and Iran from 1077 to 1231; first as vassals of the Seljuk Empire and the Qara Khitai (Western Liao dynasty), and from circa 1190 as independent rulers up until the Mongol conquest in 1219–1221.

The Khwarazmian Empire eventually became "the most powerful and aggressively expansionist empire in the Persian lands", defeating the Seljuk Empire and the Ghurid Empire, even threatening the Abbasid caliphate. In the beginning of the 13th century, the empire is thought to have become the greatest power in the Muslim world. It is estimated that the empire spanned an area of 2.3 to 3.6 million square kilometres. The empire, which was modelled on the preceding Seljuk Empire, was defended by a huge cavalry army composed largely of Kipchak Turks.

The Khwarezmian Empire was the last Turco-Persian Empire before the Mongol invasion of Central Asia. In 1219, the Mongols under their ruler Genghis Khan invaded the Khwarazmian Empire, successfully conquering the whole of it in just two years. The Mongols exploited existing weaknesses and conflicts in the empire, besieging and plundering the richest cities, while putting its citizens to the sword in one of the bloodiest wars in human history.

The date of the founding of the state of the Khwarazmshahs remains debatable. The dynasty that ruled the empire was founded by Anush Tigin (also known as Gharachai), initially a Turkic slave of the rulers of Gharchistan, later a Mamluk in the service of the Seljuks. However, it was Ala ad-Din Atsiz (r. 1127–1156), descendant of Anush Tigin, who achieved Khwarazm's independence from its neighbors.