Mastai Ferretti

Mastai Ferretti is the birth name of Pope Pio IX, who served as pope from 1846 to 1878. His long papacy is noted for the declaration of the dogma of the Immaculate Conception and for his role during the Italian unification, which significantly impacted the papal states. Pio IX is often remembered for his involvement in modern Church issues and his declaration of the First Vatican Council.