After campaigns on the land of Gur Han of Garahytay, he took the capital Otrar too. He fought bloody battles against Jengis Han but was defeated and later took refuge and died on an island in the Caspian Sea in 1220 (617).

His son, Jelaleddin, continued his resistance against the Mongol expansion and proved himself a hero unprecedented in history. He was the first to defeat the Mongols who had been invincible until then. However, internal conflicts within his ranks and the army prevented him from reaching his goals. After his stay for two years in India and many interesting adventures and journeys, he established his sovereignty in Azarbayjan from 1225-1231. 

(132.)

There are many commentaries about his ultimate end, one among which says he was killed by a Kurdish person. Though the HarezmShah state once stretched to the same borders and influence as that of the Great Seljujks, it did not survive.

(132.)

Remember Celaleddin. One wing of Celaleddin’s army defeated the Moguls in the Isfahan War, while the other wing was defeated because some of the commanders in the defeated wing had retreated. After the war, Celaleddin forced the ones who had retreated to put on headscarves and walk in the streets of Isfahan.