Greek differentiates the political enemy, πoλέµιoς, whom one might face across the battlefield with honor and respect, from the personal enemy, ἐχθρός, who may be a fellow-countryman or even a grudging ally, but who seeks your ruin and you his in a lifelong, irredeemable vendetta. Ἄναξ Jehovah understands this difference, Caesar too in Latin’s hostis and inimicus.
