What is "artephius"

Artephius (Artefius) (c. 1150) is a writer to whom a number of alchemical texts are ascribed. Although the roots of the texts are unclear and the identity of their author obscure, at least some of them are Arabic in origin. He is named as the author of several books, the Ars sintrillia, Clavis sapientiae or Clavis maioris sapientiae, and Liber secretus.