10 popes’ longest pontificates

10. Leon I

• pontificate: 21 years 1 month (7 712 days)
• date: from 29th of September 440 to 10th of November 461

9. Sylvester I

• pontificate: 21 years 11 months (8,004 days)
• date: from 31st of January 314 to 31st of December 335

8. Alexander III

• pontificate: 21 years 11 months (8,028 days)
• date: from 7th of September 1159 to 30th of August 1181

7. Pius VII

• pontificate: 23 years 5 months (8 559 days)
• date: from 14th of March 1800 to 20th of August 1823

6. Adrian I

• pontificate: 23 years 11 months (8 728 days)
• date: from 1st of February  772 to 25th of December 795

5. Pius VI

• pontificate: 24 years 6 months (8,961 days)
• date: from 15th of February  1775 to 29th of August 1799

4. Leo XIII

• pontificate: 25 years 5 months (9 280 days)
• date: from 20th of February 1878 to 20th of July 1903

3. John Paul II

• pontificate: 26 years 5 months (9 665 days)
• date: from 16th of October 1978 to 2nd of April 2005

2. Pius IX

• pontificate: 31 years 8 months (11 559 days)
• date: from 16th of June 1846 to 7th of February 1878

1. Saint Peter

• pontificate: about 34 years
• date: from about 33 to 67