Ever since its appearance in Europe five centuries ago, the rosary has been a widespread, highly visible devotion among Roman Catholics. Its popularity has persisted despite centuries of often seismic social upheaval, cultural change, and institutional reform. In form, the rosary consists of a ritually repeated sequence of prayers accompanied by meditations on episodes in the lives of Christ and Mary. As a devotional object of round beads strung on cord or wire, the rosary has changed very...