Abū Isḥāq Ibrāhīm ibn ʿAlī al-Shīrāzī was a prominent Persian Shafi'i-Ash'ari scholar, debater and the second teacher،after Ibn Sabbagh al-Shafei, at the Nizamiyya school in Baghdad, which was built in his honour by the vizier of the Seljuk Empire Nizam al-Mulk. Wikipedia