To appreciate the importance of the principles of the law of armed conflict (LOAC), judge advocates (JAs) must consider their historical endurance. The law of armed conflict has long roots, some buried so deep they have been largely forgotten. Yet these lesser-known precursors also played a crucial role in LOAC development. One forgotten pioneer hailed from a fourteenth-century French monastery, where he struggled to promote the LOAC principles of honor, humanity, and distinction.