The Liber de compositione alchemiae ("Book on the Composition of Alchemy"), also known as the Testamentum Morieni ("Testament of Morienus"), the Morienus, or by its Arabic title Masāʾil Khālid li-Maryānus al-rāhib ("Khalid's Questions to the Monk Maryanos"), is a work on alchemy falsely attributed to the Umayyad prince Khalid ibn Yazid (c. 668 – c. 704).[1] It is generally considered to be the first Latin translation of an Arabic work on alchemy into Latin, completed on 11 February 1144 by the English Arabist Robert of Chester.[2][a]
The work takes the form of a dialogue between Khalid ibn Yazid and his purported alchemical master,[3] the Byzantine monk Morienus (Arabic مريانس, Maryānus, perhaps from Greek Μαριανός, Marianos),[4] himself supposedly a pupil of the philosopher Stephanus of Alexandria (fl. early seventh century).[5] Widely popular among later alchemists, the work is extant in many manuscripts and has been printed and translated into vernacular languages several times since the sixteenth century.[6]
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