For other use, see Tabari (name)
Abu al-Hasan Ali ibn Sahl Rabban al-Tabari (c. 838–c. 870 CE) was a Persian scholar physician (a hakim), who produced the first encyclopedia of medicine. His famous pupil, Zakariya al-Razi ("Razi"), has eclipsed his stature.
Ali came from a well-known Jewish family of Merv in Tabaristan (hence al-Tabari – "from Tabaristan") but became an Islamic convert under the Abbassid caliph Al-Mu'tasim (833-842), who took him into the service of the court, in which he continued under Al-Mutawakkil (847-861). His father Sahl ibn Bishr was a famous Astrologer.
Ali ibn Sahl was fluent in Syriac and Greek, the two sources for the medical tradition of antiquity, which was lost to medieval Europe, and versed in fine calligraphy.

Sources

Muslim scholar
List of Iranian scientists