Artephius.—A great Hermetic philosopher, whose true name was never known and whose works are without dates, though it is known that he wrote his Secret Book in the XIIth century. Legend has it that he was one thousand years old at that time. There is a book on dreams by him in the possession of an Alchemist, now in Bagdad, in which he gives out the secret of seeing the past, the present, and the future, in sleep, and of remembering the things seen. There are but two copies of this manuscript extant. The book on Dreams by the Jew Solomon Almulus, published in Hebrew at Amsterdam in 1642, has a few reminiscences from the former work of Artephius.
Source: H.P.Blavatsky - The Theosophical Glossary