Sahl ibn Bishr al-Israili;
(c. 786–c. 845), also known as Rabban al-Tabari and Haya al-Yahudi (“the Jew”), was a Syriac Christian astrologer, astronomer and mathematician from Tabaristan. He was the father of Ali ibn Sahl the famous 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.