Latrocinium (from Latin latrone, ultimately from Greek latron, "pay") hire) which meant primarily a mercenary, or hired soldier, had the same meaning as miles. Latrocinium applied to a war that was not preceded by a declaration of war under the Roman laws; it was also applied to the guerrilla warfare used by the enemies of Rome. In the Middle Ages, latrocinium was a war without just cause, or piracy. Plato and Aristotle considered that latrocinium was a way of life like fishing or hunting.