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Plato used the word aeon to denote the eternal world of ideas, which he conceived was "behind" the perceived world, as demonstrated in his famous allegory of the cave.
Aeons bear a number of similarities to Christian-Judeo angels, including their roles as servants and emanations of God, and their existence as beings of light.
The aeons constitute the pleroma, the "region of light." The lowest regions of the pleroma are closest to the darkness — that is, the physical world.