A noted theologian, jurist and mystic, (1058-1111 CE), whose thoughts and writings had a major influence on the development of Sunni Islam. He was born at Tus, Khurasan in Eastern Iran and served as chief instructor at the Madrasa Niẓāmiyya in Baghdad between 1091 and 1095 CE. His works include Iḥyāʾ ʿulūm al-dīn (the Revival of the Religious Sciences), al-Munqidh min al-dalāl (Deliverance from Error) and Tahāfut al-falāsifa (the Incoherence of the Philosophers).
