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Leo XIII, known as the "Pope of the Rosary," issued an unprecedented eleven papal encyclicals on the rosary, highlighting its importance in Catholic spirituality. These encyclicals, spanning from 1883 to 1898, emphasized the rosary's power in combating evil, promoting peace, and fostering devotion to the Blessed Virgin Mary. Leo XIII's prolific writings on the rosary solidified its significance as a powerful spiritual tool for Catholics worldwide.