=== MOHAMMAD IBN ZAKARIYA AL-RAZI === Abu Bakr Mohammad Ibn Zakariya al-Razi (ابو بکر محمد ابن زکریا الرازی) born on 28 August 865 and died on 6 October 925 in (the Persian Empire, now Iran (Ray near Tehran. Razi achieved mastery in a number of fields, initially, he was interested in music but later on he learnt medicine, mathematics, astronomy, chemistry and philosophy from a student of Hunayn Ibn Ishaq (حنین ابن اسحاق) , who was well versed in the ancient Greek, Persian and Sub-Continent systems of medicine and in other subjects. He also studied under Ali Ibn Rabban(علی ابن ربان) .