Pope

=== Longest-reigning popes ===
[[File:Popepiusix.jpg|thumb|upright|[[Pope Pius IX]], the pope with the longest verifiable reign]]
The longest papal reigns of those whose reign lengths can be determined from contemporary historical data are the following:

# [[Saint Peter]] ({{Circa|30}}–64/68): c. 34 – c. 38 years (Around 12,000–14,000 days)<ref>{{cite web | url=https://cnewsliveenglish.com/news/19843/saint-peter-the-first-pope-sm | title=Saint Peter : The First Pope (Successors of Peter - Part 1) | access-date=30 April 2023 | archive-date=30 April 2023 | archive-url=https://web.archive.org/web/20230430072444/https://cnewsliveenglish.com/news/19843/saint-peter-the-first-pope-sm | url-status=live }}</ref>
# [[Pope Pius IX|Bl. Pius IX]] (1846–1878): 31 years, 7 months and 23 days (11,560 days)
# [[Pope John Paul II|St. John Paul II]] (1978–2005): 26 years, 5 months and 18 days (9,665 days)
# [[Pope Leo XIII|Leo XIII]] (1878–1903): 25 years, 5 months and 1 day (9,281 days)
# [[Pope Pius VI|Pius VI]] (1775–1799): 24 years, 6 months and 15 days (8,962 days)
# [[Pope Adrian I|Adrian I]] (772–795): 23 years, 10 months and 25 days (8,729 days)
# [[Pope Pius VII|Pius VII]] (1800–1823): 23 years, 5 months and 7 days (8,560 days)
# [[Pope Alexander III|Alexander III]] (1159–1181): 21 years, 11 months and 24 days (8,029 days)
# [[Pope Sylvester I|St. Sylvester I]] (314–335): 21 years, 11 months and 1 day (8,005 days)
# [[Pope Leo I|St. Leo I]] (440–461): 21 years, 1 month, and 13 days (7,713 days)

During the Western Schism, [[Avignon Pope Benedict XIII]] (1394–1423) ruled for 28 years, 7 months and 12 days, which would place him third in the above list. Since he is regarded as an [[anti-pope]], he is not included there.