<p>Gıyaseddin Keyhüsrev II ascended the throne after his father Keykubad. The liquidation of the viziers of the father weakened the state. 1240 Isaac the father rebellion shook Anatolia. The defeat of the Mongols in the Battle of Kosedag in 1243 effectively ended the Seljuk independence. The Sultan was criticized for leaving the battlefield. After that, Mongol domination and vizier rivalry began in Anatolia. Zoning stopped, taxes increased. II.The Keyhüsrev period is on the verge of a decline from the golden age to vassalage. It reminds the loss of central discipline as a historical lesson.</p>
