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This led Genghis Khan to attack the Khwarezmian Dynasty.
The destruction of the Khwarezmian Empire soon followed.
The Atabeg State fell in 1225 when it was included into the Khwarezmian Empire.
His tomb was destroyed by the Mongols in 1221, during their invasion of the Khwarezmian Empire.
Also, Khwarezmian Empire demolished western part of the Kara-Khanid state in 1212.
He had already conquered Persia, then under the Khwarezmian Empire's control, and was moving on towards Baghdad as well.
August 23 - The city's citadel, the Tower of David, surrenders to Khwarezmian Empire.
In 1219-21 the Khwarezmian Empire suffered a devastating invasion by the Mongol army of Genghis Khan.
Though the Mongols had destroyed the Khwarezmian Empire in 1220, many Khwarezmians survived by working as mercenaries in northern Iraq.
Kuchlug's forces had been battling the powerful Khwarezmian Empire, whose leader was the Muslim Muhammad II of Khwarezm.
Subsequently he was given the command of operation against the city of Urgench (Gurganj, in present-day Turkmenistan), the capital of the Khwarezmian Empire.
In 1219, in retaliation for the murders of his ambassadors, the Mongol Khan, Genghis Khan, invaded the Khwarezmian Empire.
In 1226 Tbilisi was captured by the refugee Khwarezmian Empire Shah Mingburnu and its defences severely devastated and prone to Mongol armies.
The siege occurred while the Mongols were pursuing Jalal ad-Din Mingburnu, the last ruler of the Khwarezmian Empire, and his newly raised forces in Afghanistan.
After the defeat of the Khwarezmian Empire in 1220, Genghis Khan gathered his forces in Persia and Armenia to return to the Mongolian steppes.
The Mongol army under Genghis Khan, generals and his sons crossed the Tien Shan mountains by entering the area controlled by the Khwarezmian Empire.
He recruited his horsemen from the Khwarezmians, and directed the remains of the Khwarezmian Empire into the Levant, where he wanted to organize a strong defense against the Mongols.
The Mongol Empire swept through Central Asia, invaded Khwarezmian Empire and sacked the cities of Bukhara and Samarkand, looting and massacring people everywhere.
Around that time, the Qara Khitai were dealing with rebellions in the east, as well as engaging in a struggle against Muhammad II of the Khwarezmian Empire in the west.
Later, Bukhara became part of the kingdom of Khwarezmian Empire, who incurred the wrath of the Mongols by killing their ambassador, and in 1220 the city was leveled by Genghis Khan.
Shortly before, the Mongols appeared in Köneürgenç, the capital of the Khwarezmian Empire, where a war council had taken place and where one of the commanders proposed to open the battle against the Mongols.
The Mongol Empire first appeared in the Caucasus in 1220 as generals Subutai and Jebe pursued Muhammad II of Khwarezm during the destruction of the Khwarezmian Empire.
According to some sources, Qutuz claimed that his original name was Mahmud ibn Mamdud and he was descended from Ala ad-Din Muhammad II, a ruler of the Khwarezmian Empire.
In 1227/1228, Kayqubad advanced into eastern Anatolia, where the arrival of Jalal ad-Din Mingburnu, who was fleeing the destruction of his Khwarezmian Empire by the Mongols, had created an unstable political situation.
Inalchuq (or Inalchuk) (died 1219) was governor of Otrar in the Khwarezmian Empire in the early 13th century, known mainly for helping to provoke the successful and catastrophic invasion of Khwarezmia by Genghis Khan.
In 1221, the province was the site of the battle between the invading Mongols, led by Genghis Khan, and the Khwarezmian Empire led by Jalal ad-Din Mingburnu, where the Mongols were defeated.