De Coelesti Hierarchia
The Pseudo-Dionysian treatise on the angelic orders and their mediating role between God and humanity.
Commentary on the Pentateuch of Moses
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Canons Bearing a Torch Before the Pentateuch
— Cited (chapter 4) for the view that divine apparitions were made through angels
"So Dionysius, chapter 4 of the Celestial Hierarchy"