Who Was The Longest Reigning Pope?
Who Was The Longest Reigning Pope? Bl. Pius IX (1846–1878): 31 years, 7 months and 23 days (11,560 days). St. John Paul II (1978–2005): 26 years, 5 months and 18 days (9,665 days). Who was the longest reigning pope in history? Pius IX (Italian: Pio IX, Pio Nono; born Giovanni Maria Mastai Ferretti; 13 May