Abu Zayd al-Balkhi

Abu Zayd al-Balkhi, born in the year eight hundred fifty in Shamistiyan, located in the province of Balkh in Greater Khorasan, was a remarkable Persian Muslim polymath. His diverse expertise spanned geography, mathematics, physics, architecture, and medicine, showcasing his profound impact on various fields of knowledge.

A disciple of the esteemed philosopher al-Kindi, al-Balkhi made significant contributions to the study of terrestrial mapping, establishing the renowned 'Balkhī school' in Baghdad. This institution became a pivotal center for geographical studies, influencing future generations of scholars and cartographers.

In addition to his geographical pursuits, al-Balkhi was a pioneer in the understanding of mental health. He was among the first to recognize that mental illnesses could stem from both psychological and physiological factors. His groundbreaking work led him to categorize emotional disorders into four distinct types: fear and anxiety, anger and aggression, sadness and depression, and obsessions.