An Historical Summary of Angelic Hierarchies from Part VII: The “Seven” Thrones in In Operibus Sigillo Dei Aemeth by David Richard Jones.

“It is not our intention to go into all of the complexities related to this document, its history and evolution, but fragments of the text are found both in the Dead Sea Scrolls and in Karaite texts found in the Cairo Geniza. It has been known for some time that a relationship exists, at least textually and theologically, between the sectarians, and exegesis.” [via]