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Al-Shahrastani

Tāj al-Dīn Abū al-Fath Muhammad ibn `Abd al-Karīm ash-Shahrastānī (1086–1153 CE) was an influential Persian historian of religions and a historiographer. His book, Kitab al–Milal wa al-Nihal (lit. The Book of Sects and Creeds) was one of the pioneers in developing a scientific approach to the study of religions. Besides these, he was also an Islamic scholar, philosopher and theologian.