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Biography
Abu Sulayman Muhammad Sijistani, (Persian: ابوسلیمان سجستانی) also called al-Mantiqi (the Logician) (c. 932 – c. 1000 CE), named for his origins in Sijistan or Sistan province in present-day Iran, became the leading Persian philosopher of Islamic humanism in the Baghdad of his time.
Deeply religious, he regarded both religion and philosophy as valid and true; but separate, concerned with different issues, and proceeding by different means. He thus rejected the claims of the theologians employing Ilm al-Kalam to have built a theology "proved" by rationality and of the Brethren of Purity to offer a synthesis of philosophy and religion.
His best-known work is Siwān al-Ḥikma "Vessel of Wisdom", a history of philosophy from the beginning to his own time.