Photos: Shortest-reigning popes

With the resignation of Pope Benedict, take a look at history's shortest-reigning popes. You can also view our list of the longest-reigning popes.

Pope Urban VII reigned for 13 calendar days in 1590, the shortest papal tenure in history.

Boniface VI reigned for 16 days in the year 896.

Pope Celestine IV reigned for 17 days and died before consecration in 1241.

Pope Theodore II reigned for 20 days in 897.

Pope Sisinnius reigned for 21 days in 708.

Pope Marcellus II reigned for 22 days in 1555.

Pope Damasus II reigned for 24 days in 1048.

Pope Pius III reigned for 27 days in 1503.

Pope Leo XI also reigned for 27 days in 1605.

Pope Benedict V was the first to reign for 33 days in 964.

Pope John Paul I also reigned for 33 days before his death in 1978.