De Coelesti Hierarchia is a Pseudo-Dionysian work onangelology, written in Greek and dated to ca. the 5th century CE; it exerted great influence on scholasticism and treats at great length the hierarchies of angels. The work has also been very influential in the development ofOrthodox Christian theology. Thomas Aquinas (Summa Theologica, I.108) follows the Hierarchia (6.7) in dividing the angels into three hierarchies each of which contains three orders, based on their proximity to God, corresponding to the nine orders of angels recognized by Pope St Gregory I. 1. Seraphim, Cherubim, and Thrones; 2. Dominations, Virtues, and Powers; 3. Principalities, Archangels, and Angels.

Heavenly Hierarchy by Pseudo-Dionysius is a Pseudo-Dionysian work on angelology, written in Greek and dated to the 5th century AD. It exerted great influence on scholasticism and treats at great length the hierarchies of angels. Excerpt: "That every divine illumination, while going forth with love in various ways to the objects of its forethought, remains one. Nor is this all: it also unifies the things illuminated."

Here are the complete works of the enigmatic fifth- and sixth-century writer known as the Pseudo Dionysius, prepared by a team of six research scholars.

This book examines the role of angels in medieval and Renaissance art and religion from Dante to the Counter-Reformation.