Athene
(Also Athena in some orthographies) The ancient Greek virgin goddess of wisdom and the arts and sciences, but also of war.
Favorite daughter of Zeus, king of the gods, Athene is the only other deity allowed to wield his thunderbolt, and uses both her power and her good sense to keep other less manageable gods in line. She spends an unusual amount of time in the company of mortals, happily associating with the smartest of them (for example, the wandering hero Odysseus or Ulysses, whom she constantly supports during his long travels home from the Trojan War). She is the patroness of the Greek city of Athens, and therefore also of the fledgling art of democracy, which the Athenians pioneered.
Athene displays various of the traits associated with both the Wise Power and the Michael Power or the One's Champion, and is therefore often assumed by wizards to have been an avatar of one (or both) of them. The One's Champion in particular states that this is one of the names he (or she) has occasionally been known by among mortals. (HW et seq.)