The anonymous theologian known as Pseudo-Dionysius, who was responsible for arranging the angelic hierarchy into nine orders, had a significant influence on mediaeval European mysticism. This book places him in his religious and political context in 6th century Syria, and uncovers the hidden agenda which lies behind his writings. New evidence is presented to establish the dating of the corpus more accurately than has been done before. Rather than analysing the minutiae of Dionysius' thought, Rosemary Arthur focuses on his sources for, and treatment of, the Angelic Hierarchy and the Dazzling Darkness, with a view to ascertaining his motive for writing, his relationship with his opponents and his need to hide his identity.