Canon Juan Mastai Ferretti in Lujan

January 18, 1824. On the day the Chair of St. Peter was celebrated, Canon Juan Mastai Ferretti, who would later assume the government of the Catholic Church under the name of Pius IX and would be the Pope who would promulgate the Dogma of the Immaculate Conception of Mary, celebrated Mass at the shrine of Lujan. He had arrived in Luján on January 17 as secretary of the Apostolic Nuncio Mons. Juan Muzzi, whom he accompanied in the retinue bound for Chile.