Abu Zayd Ahmed Ibn Sahl Balkhi

Abu Zayd Ahmed ibn Sahl Balkhi (850-934) was a Persian polymath who studied and wrote about, in addition to many other academic interests, the relationship between body, mind and soul. More than sixty books and manuscripts are attributed to him as a result of his meticulously researching disciplines as varied and diverse as geography, medicine, theology, politics, philosophy, poetry, literature, Arabic grammar, astrology, astronomy, mathematics, biography, ethics, and sociology. He was one of the first scholars to study the link between physical and mental health.