Encyclopedia of the Brethren of Purity
The Encyclopedia of the Brethren of Purity also variously known as the Epistles of the Brethren of Sincerity, Epistles of the Brethren of Purity and Epistles of the Brethren of Purity and Loyal Friends is an Islamic encyclopedia in 52 treatises (rasā'il) written by the mysterious Brethren of Purity of Basra, Iraq sometime in the second half of the 10th century CE. It had a great influence on later intellectual leading lights of the Muslim world, such as ibn Arabi, and was transmitted as far abroad within the Muslim world as al-Andalus.
Manuscript of the Brethren's Kitab Ikhwan al-Safa i.e. the "Epistles of the Brethren of Purity". Copy created in late Safavid Iran, dated c. 17th century
Double-leaf frontispiece from the "Encyclopedia of the Brethren of Purity". Baghdad, 1287. Süleymaniye Library (MSS Esad Efendi 3636).
Encyclopedia of the Brethren of Purity (detail). Baghdad, 1287 CE.
The Brethren of Purity were a secret society of Muslim philosophers in Basra, Iraq, in the 9th or 10th century CE.
Double-leaf frontispiece from the "Encyclopedia of the Brethren of Purity". Baghdad, 1287. Süleymaniye Library