Khoja Ahmed Yasawi, also popularly known as Hazrat Sultan (1103, Sayram — 1166, Turkistan), was a Central Asian philosopher, Islamic preacher, and Sufi poet. He wrote his works in the Karakhanid-Uyghur language, the literary language that developed at the court of the Karakhanids. He is the author of the poetry collection "Divan-i Hikmat."
By founding a school of Sufism and mentoring a large number of disciples, he played one of the key roles in the spread of Islam among the Turks of Central Asia. After his death, by the order of Amir Timur, a mausoleum was erected for Ahmed Yasawi, which became a revered site of pilgrimage for many Muslims in the region.
He was the third caliph (successor) of the Khajagan order and the founder of the Yasawiya order (Tariqah).