Book of Secrets (Syriac)
The Book of Secrets, fully the Book of Hierotheus on the Hidden Mysteries of the House of God, is a Syriac treatise which survives in a single manuscript copied in the 13th century (now British Library, Add MS 7189). The work is pseudonymous and its author is conventionally known as Pseudo-Hierotheus. He has been tentatively identified with Stephen bar Sudayli.