Sahl ibn Bishr

Sahl ibn Bishr al-Israili (c. 786–c. 845) was a Jewish or Syriac Christian astrologer, astronomer and mathematician from Tabaristan. He was the father of Ali ibn Sahl the scientist and physician, who became a convert to Islam.

He served as astrologer to the governor of Khuristan and then to the vizier of Baghdad. He wrote books on astronomy, astrology, and arithmetic, all in Arabic.