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The Secretum Secretorum or Secreta Secretorum (Latin for "secret of secrets"), also known as the Sirr al-Asrar (Arabic: كتاب سر الأسرار, lit. 'The Secret Book of Secrets'), is a treatise which purports to be a letter from Aristotle to his student Alexander the Great on an encyclopedic range of topics, including statecraft, ethics, physiognomy, astrology, alchemy, magic, and medicine. The earliest extant editions claim to be based on a 9th-century Arabic translation of a Syriac translation of the lost Greek original. It is a pseudo-Aristotelian work. Modern scholarship finds it likely to have been written in the 10th century in Arabic. Translated into Latin in the mid-12th century, it was influential among European intellectuals during the High Middle Ages.