 Encyclopedia of the Brethren of Purity

The "Encyclopedia of the Brethren of Purity" refers to a significant philosophical and scientific work produced by a group known as the Brethren of Purity (Ikhwan al-Safa) in the 10th century in the Islamic world, particularly in the region that is modern-day Iraq. The Brethren of Purity were a secretive society of scholars and thinkers who aimed to promote knowledge and understanding across various fields, including philosophy, mathematics, astronomy, ethics, and theology.