Blessed Bartolo Longo (1841–1926) was an Italian lawyer who, during his university years, became involved in occult practices and was eventually ordained as a Satanic priest. Experiencing profound despair, he returned to the Catholic faith through the guidance of a Dominican priest. Bartolo dedicated his life to promoting the Rosary and founded the Shrine of Our Lady of Pompeii, transforming the area into a center of Marian devotion and charitable works.

Pope John Paul II beatified Bartolo Longo on October 26, 1980, referring to him as the "Apostle of the Rosary." In his homily, the Pope highlighted Bartolo's transformation, stating, "By his love for Mary he became a writer, apostle of the Gospel, propagator of the Rosary, founder of the famous Sanctuary despite enormous difficulties and hardship."

Bartolo Longo's life exemplifies the power of conversion and the profound impact of Marian devotion. His legacy continues through the Shrine of Our Lady of Pompeii, which remains a pilgrimage site, and his writings that inspire many to embrace the Rosary as a means of spiritual renewal.