The Ikhwan al-Safa (Brethren of Purity), the anonymous adepts of a tenth-century esoteric fraternity based in Basra and Baghdad, hold an eminent position in the history of science and philosophy in Islam due to the wide reception and assimilation of their monumental encyclopaedia, the Rasa'ilIkhwan al-Safa (Epistles of the Brethren of Purity). This compendium contains fifty-two epistles offering synoptic accounts of the classical sciences and philosophies of the age; divided into four classificatory parts, it treats themes in mathematics, logic, natural philosophy, psychology, metaphysics, and theology, in addition to didactic fables. The Rasa'il constitutes a paradigmatic legacy in the canonization of philosophy and the sciences in mediaeval Islamic civilization, as well as having shown a permeating influence in Western culture.
The present volume is the second of this definitive series, consisting of the very first critical edition of the Rasa'il in its original Arabic, complete with the first fully annotated English translation. Prepared by Professor Carmela Baffioni, Epistles 10-14 comprise the foundations of logic, which remained a fundamental component in pedagogy until the twentieth century. The Ikhwan treat the Isagoge and the larger part of the Organon, both of which were circulating through the Islamic world at that time, as they set about detailing the ten categories of existents, the five predicables, and other such commonplaces of Aristotelian logic, including his seminal method of syllogistic inference. With the claim that logic is the noblest of man's arts, and man the noblest of creatures, the Ikhwan cast Aristotelian tropes in a spiritual light.

The nine papers collected here explore a broad range of sources for texts from the classical period of Arabic philosophy, and a broad range of influence exerted by these texts. By the 'classical period' is meant that part of the Arabic philosophical tradition normally included in the canon of 'medieval' philosophy. It begins in the ninth century, which is when the impact of Greek philosophical and scientific works began to be felt, thanks to their translation under the 'Abbasid caliphs, and ends in the twelfth century. This volume focuses on the influences felt by, and exerted by, the four main philosophers of this period: al-Kindi, al-Farabi, Avicenna, and Averroes. But the historical range covered extends well past the twelfth century, into Latin Renaissance philosophy and Islamic philosophy of the seventeenth century. Philosophical themes include human psychology, logic, the influence of Neoplatonism, and problems in Aristotelian natural philosophy.