An Historical Summary of Angelic Hierarchies from Part VII: The “Seven” Thrones in In Operibus Sigillo Dei Aemeth by David Richard Jones.
“Again, it is not our purpose to elaborate the somewhat complicated history and understanding of these texts and their authorship, but it should be understood that until the 16th C. these texts were attributed to Dionysus the Areopagite (Acts 17), otherwise known as St. Denys, though scholarship has determined definitively that they are the work of a 4-5th C. Neoplatonic follower of Proclus.” [via]