The medieval code of chivalry demanded that warrior elites demonstrate fierce courage in battle, display prowess with weaponry, and avenge any strike against their honor. They were also required to be devout Christians. How, then, could knights pledge fealty to the Prince of Peace, who enjoined the faithful to turn the other cheek rather than seek vengeance and who taught that the meek, rather than glorious fighters in tournaments, shall inherit the earth? By what logic and language was...