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

“St Paul’s usage of the term Thrones in this context indicates that it must have had meaning within then-current metaphysics. Though it is possible that the context of Colossians is an entirely mundane and political one, thones, and even dominions, principalities, and so on have been interpreted by subsequent Christian theologians in an almost entirely metaphysical way.” [via]