Aḥmad Yasawī (Ahmet Yesevi), son of Ibrāhīm (d. 562/1167), was a famous Turkic mystic, poet and Sufi master from Central Asia. There is some debate as to whether his birthplace was Sayram (Sīrām) (Köprülü, 61; Eraslan, 2/159; Aḥmad Yasawī, introd., 9) or the city of Yasī (Kāshifī, 1/17; Khānī, 109). The former would appear to be more accurate, given the account in Jawāhir al-abrār min amwāj al-biḥār, written by Ḥazīnī, which according to Köprülü (pp. 27, 61, 62 and notes) is the oldest and most important source for the life and …