Marina Della Valle & Luigia Piovano — St. John Bosco

The process of canonizing John Bosco required the Vatican to verify four separate miraculous healings — two for beatification (1929) and two for canonization (1934).

For beatification, the Sacred Congregation of Rites approved two cures: Sr. Provina Negro, 31, a member of the Daughters of Mary Help of Christians in Turin, was healed from a hemorrhaging stomach ulcer on July 26, 1906; and Teresa Callegari, 26, of Castel San Giovanni, was healed from acute post-infectious polyarthritis with severe wasting (marasmus) in January 1921.

For canonization, two additional cures were verified: Anna Maccolini, 74, of Rimini, was healed from severe phlebitis in her left limb at the end of December 1930; and Caterina Lanfranchi Pilenga, 62, of Urgnano, was healed from chronic arthritis of the knees and feet on May 6, 1931, at the Basilica of Mary Help of Christians in Turin — the very church Don Bosco had built.

The diocesan court in Turin heard sworn testimony from primary witnesses and medical professionals across two separate investigation phases (1927–1929). The Sacred Congregation of Rites conducted ante-preparatory and preparatory congregations with Vatican medical examination for each case. All four healings were instantaneous, complete, and lasting, with no medical treatment that could account for the cures. Don Bosco was beatified on May 2, 1929, and canonized on April 1, 1934, by Pope Pius XI — Easter Sunday — before a crowd of 60,000 in St. Peter's Basilica.