Secretum Secretorum
The Secretum Secretorum or Secreta Secretorum (Latin, '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.