What is "hyperuranion"

Hyperuranion or topos hyperuranios (, accusative of ὑπερουράνιος τόπος, "place beyond heaven") is alternately a concept used by Plato to mean a perfect realm of archetypal ideas, or a later medieval concept that claims God within the empyrean exists outside of heaven and controls it as the first mover from there for heaven even to be a part of the moved.