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Who has been the longest-reigning pope (not including St. Peter)?

Pius IX is the answer. He started reigning as Pope on June 16, 1846 and died on February 7, 1878, and reign of 31.6 years. According to internet research, the average reign for a Pope is 7.5 years. See this internet article: <a href='https://www.catholic-hierarchy.org/longest.html'>Longest Reigning Popes</a><br><br> <center><img src='../VPS/images/296/632.jpg' height='200'>  <img src='../VPS/images/296/633.jpg' height='200'>  <img src='../VPS/images/296/634.jpg' height='200'><br><b>Pope Pius IX Issue, Scott # 632-634 (1978)</b><br><br> <p align=left>For more on Pope Pius IX see: <br> • Michael Lamothe <a href='http://vaticanstamps.org/vaticannotes/idisplay.php?p=68-383-56-57&r=0'>Vatican Stamps - The Art of the Engraver - Artist, Pietro Arghittu</a> <i>Vatican Notes</i> Volume: 68: 2020, Issue 383, Page 56<br> • Thomas K Adkins <a href='http://vaticanstamps.org/vaticannotes/idisplay2.php?p=331-23&r=0'>Pope Pius IX: Philatelic Retrospective<a> <i>Vatican Notes</i> Volume: 55: 2007, Issue, 5 , Page 23 </p><br><br>

Pius IX cut a path in history rivaled by few others. The longest reigning pope, Pius held the mantle from 1846 until his death in 1878. 1 St. Peter exact dates unknown roughly 35 years 2 Bl. Pius IX 16 Jun 1846 21 Jun 1846 7 Feb 1878 31.6 31.6 3 John Paul II 16 Oct 1978 22 Oct 1978 2 Apr 2005 26.4 26.4 4 Leo XIII 20 Feb 1878 3 Mar 1878 20 Jul 1903 25.4 25.4 5 Pius VI 15 Feb 1775 22 Feb 1775 29 Aug 1799 24.5 24.5 6 Adrian I 1 Feb 772 9 Feb 772 25 Dec 795 23.9 23.9 7 Pius VII 14 Mar 1800 21 Mar 1800 20 Aug 1823 23.4 23.4