Ikhwân al-Safâ’

The Ikhwân al-Safâ’ or “Brethren of Purity”, as their name is commonly translated, are the authors of one of the most complete Medieval encyclopedias of sciences, antecedent at least two centuries to the best known in the Latin world (by Alexander Neckham, Thomas de Cantimpré, Vincent de

https://plato.stanford.edu/entries/ikhwan-al-safa/