Fakhr al-Din Ali, better known as Sâhib Ata or Sâhip Ata, held a number of high offices at the court of the Sultanate of Rum from the 1250s until his death in 1288. He was the dominant personality in Anatolia after the death of the Pervane Mu’in al-Din Suleyman in 1277. He is perhaps best remembered for the charitable foundations he established in cities across the Sultanate of Rum.
^J.M. Rogers, “The Çifte Minare Medrese at Erzurum and the Gök Medrese at Sivas: A Contribution to the History of Style in the Seljuk Architecture of 13th Century Turkey” Anatolian Studies, Vol. 15. (1965), pp. 66.