Enn. I. vi. 1. 9 πν μν γρ μορφον, πεφυκς μορφν κα εδος δχεσθαι μοιρν ν λγον κα εδους εδονς ασχρν κα ξω θεου λγον. It is strange that no one seems to have questioned ξω θεου λγον which, after μοιρν ν λγον is merely tautologous: and what point is there here in ‘divine reason’? Since, in these chapters on ‘beauty’, Plotinus has the Phaedrus much in mind, it is natural to suppose that what he wrote was ξω θεου λγον (...) borrowed from Phaedr. 247 A. (shrink)

Not being an historian but a philosopher, largely concerned with political theory, Plato was not primarily interested in historical inquiry for its own sake. His references to history or prehistory, when they occur, are introduced for the purpose of illustrating some particular point of doctrine, generally ethical or political.