Only preserved in a single manuscript in Tehran, this remarkable twelfth-century Qur'anic commentary by Muhammad b. 'Abd al-Karim al- Shahrast=an=i marks the achievement of a lifelong, arduous quest for knowledge. Shahrast=an=i began writing Mafatih al-asr=ar or Keys to the Arcana towards the end of his life and the work reflects the brilliant radicalism of his more private religious views. The introduction and opening chapter of this virtually unknown work is presented here in a bilingual edition, which also includes an introduction and contextual notes by Dr Toby Mayer.

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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 'il Ikhwan 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...