Abū Bakr Muhammad ibn Zakariyyā al-Rāzī. Al-Razi was a teacher and doctor. Al-Razi was born in c.854 and died 925 or 935.  Razi was born in the city of Rey situated on the Great Silk Road that for centuries assisted trade. His name Razi in Persian means “from the city of Rey”. He went to Baghdad (in Arabic “city of peace”)  to get a  job as a doctor. He discovered smallpox and made a cure for it. He also mad a book called Kitāb al-Manṣūrī for average town people who had a sicknesses and how to cure it. He made several books but that one was the most extravagant. He helped many people though years of work which led to better health, better doctors and better surgery.