al-Kindi

Abu Yusuf Ya'qub ibn Ishaq ibn al-Sabbah al-Kindi, called the "Philosopher of the Arabs". Ibn al-Nadim describes him as the most excellent man of his age and the unique one of his time in knowledge of the ancient sciences, and says his books were on logic, philosophy, geometry, arithmetic, music and the stars. ²

Al-Mas'udi counts him among those who engaged in the sciences of astronomy after the appearance of Islam, together with al-Khwarizmi, Abu Ma'shar, al-Farghani, al-Battani and others. ¹

Al-Mas'udi says that he wrote a treatise in two parts refuting the claims of those who claim to make gold and silver without their ores. ³

Ibn al-Nadim adds that he "was a miser". ²