Liber de compositione alchemiae

The ("Book on the Composition of Alchemy"), also known as the ("Testament of Morienus"), the , or by its Arabic title ("Khalid's Questions to the Monk Maryanos"), is a work on alchemy falsely attributed to the Umayyad prince Khalid ibn Yazid (). 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. and , both referring to and ).}}

The work takes the form of a dialogue between Khalid ibn Yazid and his purported alchemical master, the Byzantine monk Morienus (Arabic , , perhaps from Greek , ), himself supposedly a pupil of the philosopher Stephanus of Alexandria ( seventh century). 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. Provided by Wikipedia