Plutarch in On Tranquillity of Mind discusses a way to use the famous phrase Know Thyself.
Some Figures mentioned:
Sertorius
Eumenes,
Philip II of Macedon
Alexander the Great
Dionysius I, Tyrant of Syracuse
Philoxenus the Poet
Pindar
Empedocles
Plato
Democritus
Ismenias, wealthy citizen of Thebes
Epaminondas, Theban general
Euripides
Quotes:
"Know Thyself"
"Rule the Sparta you got"