The Arma Christi, the cluster of objects associated with Christ's Passion, was one of the most familiar iconographic devices of European medieval and early modern culture. From the weapons used to torment and sacrifice the body of Christ sprang a reliquary tradition that produced active and contemplative devotional practices, complex literary narratives, intense lyric poems, striking visual images, and innovative architectural ornament. The book opens with a substantial introduction that surveys previous scholarship and situates the Arma in their historical and aesthetic contexts. The ten essays that follow explore representative examples of the instruments of the Passion across a broad swath of history, from some of their earliest formulations in late antiquity to their reformulations in early modern Europe. Together, they offer the first large-scale attempt to understand the Arma Christi as a unique cultural phenomenon of its own, one that resonated across centuries in multiple languages, genres, and media.