How many people lived in Baghdad during AD?

During the height of the Abbasid Caliphate around AD 800, Baghdad is estimated to have had a population of over one million people, making it one of the largest and most cosmopolitan cities of the time. Its population included a diverse mix of cultures, religions, and professions, contributing to its reputation as a major center of learning and commerce. However, population estimates can vary, and precise numbers are difficult to determine due to the lack of comprehensive historical records.