Abu Ma‘shar al-Balkhi, Latinized as Albumasar, was an early Persian Muslim astrologer, thought to be the greatest astrologer of the Abbasid court in Baghdad. While he was not a major innovator, his practical manuals for training astrologers profoundly influenced Muslim intellectual history and, through translations, that of western Europe and Byzantium. August 14, 787 – 886; died at about 98. Alive at the same time as Charlemagne, Muḥammad ibn Musa al-Khwarizmi, Abu Nuwas, Al-Shafi'i, and Alfred the Great. Wiki link