Celaleddin Harezmshah (1220-1231)   

       Before his death, Sultan Alaeddin Muhammed had bequeathed in his lifetime that his son, Celaleddin Harezmshah would replace him. The other two brothers and some of the emirs tried to kill Celaleddin; therefore, he had to ran away from Harezm to Khorasan. In fact, he could not stay there due to the Mongolians. Afterwards, Celaleddin had to run away from the Mongolians at all times. Firstly, he went to Gazne and then, to India. He resided in India for three years. Then, he passed to Kirman, and went to Farsi, Isfahan and Iraq-i Acem regions successively. He captured Tabriz in July of 1225, and established his headquarters in this region. The rest life of Celaleddin passed by with the struggles with the neighbouring states. The states that he fought against were the Tutors of Azerbaijan, Georgians, Eyyubi State, Mongolians and Turkey Seljuk State. He besieged Ahlat that was under the dominion of Eyyubi State in the year of 1229 and captured this city on the date of 14th May 1230. Ahlat was in ruins due to this blockade. The destruction of this Turkish city led to the decrease of Celaleddin's influence in respect of prestige. As a matter of fact, the united armies of the Eyyubi-Turkey Seljuk States totally defeated him in Yassi-Çimen in a crushing manner (10th August 1230). Afterwards, the Mongolians set in motion in order to annihilate Sultan Celaleddin. Celaleddin proposed alliance to the Turkey Seljuk and Eyyubi States, and stated that he could prevent the Mongolian threats. However, his proposal was rejected. He lost everyhing he possessed upon the successive raids of the Mongolians. As a result, he was killed by the Kurds in the mountains while he wanted to run away towards the regions of Meyyafarikin (August 1231). Therefore, the last representative of the Harezmshah State lost his life in a place far and away from Harezm.

      Harezm had an important position that established a link between the Islam world, the Far East, the nomads in the steppe lands and partially between the Russian and Baltic States. This geographical position of the region gave a significant opportunity to the people of Harezm to play an important role in trade. The people of Harezm had developed the agriculture to a high level with the big irrigation plants. Furthermore, Harezmshah State had also undertaken the duty to protect some of the borders of the Islam world against the nomadic Turkish tribes that had not yet adopted the religion of Islam and that lived in the steppe lands.