Ash'arism (Arabic:الأشعرية, al-Ashʿariyya) is a theological school of Sunni Islam that is based on the theological ideas of Abu l-Hasan al-Ash'ari (b. 260/873-4 d. 324/935-6). In the beginning of his scientific journey, He was Mu'tazili but after a while he was seeking a moderate way between radical rationalism of Mu'tazila and anti-rationalism of Ahl al-Hadith.