The Celestial Hierarchy
The Celestial Hierarchy (De caelesti hierarchia) is the principal angelological treatise of the Christian Neoplatonist writing under the name Dionysius the Areopagite, probably in the late fifth or early sixth century. It interprets biblical images of heavenly beings as a graded economy of purification, illumination, and perfection, famously arranging nine angelic orders in three triads. Through its Greek and Latin transmission, its vocabulary of hierarchy and participation became enormously influential in Byzantine and medieval Latin theology, including the angelology of Aquinas and later commentators. Schola presents the work in Latin and English.