Dionysius

(fl. c. A.D. 500) Pseudo Dionysius Christian neo-Platonist theologian, in the west called Saint Denys (or Denis), and by modern scholars labeled Pseudo Dionysius because his identification with Dionysius the Areopagite, mentioned in Acts 17:34, is not credible. An author of an extremely influential little treatise on the incomprehensibility of God called Mystical Theology, as well as a treatise about concepts used to describe God called On the Divine Names, and a treatise on the nine orders of angels called Celestial Hierarchy.