Al-Razi

Al-Razi, also known as Rhazes, was a prominent Persian physician, philosopher, and alchemist from the 9th century. He is best known for his pioneering work in medicine, particularly in the field of clinical diagnosis and the study of infectious diseases. Al-Razi authored "Kitab al-Hawi," an influential medical encyclopedia, and was among the first to distinguish between smallpox and measles. His emphasis on observation and experimentation laid foundational principles for modern medicine. Additionally, he contributed to chemistry and was a pivotal figure in alchemical practices, promoting the methodical study of substances and their properties.