After Saint Peter, the longest reigning pope was Pope Pius IX who served for 31 years, 7 months and 23 days.
Rhe longest reigning pope was St. Peter who ruled for about 35 years. Pius IX was the second longest reigning pope. Pius IX was the longest-serving pope after Peter, holding the office for nearly 32 years.
Pope Francis is the reigning pope in 2013.
Pius IX served 31 years, 7 months and 23 days from 1846 to 1878 was the second longest reigning pope.
Adrian I (772-795): 23 years, 10 months and 25 days (8,729 days)
Pope Alexander III was reigning at the time Thomas Becket was murdered in the year 1170.
The longest reigning monarch in Thailand is His Majesty King Bhumibol Adulyadej.
Pope Eugene IV was reigning in the year 1439.
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Pope Paul became the first reigning pope to visit the Americas where he addressed the United Nations in New York City.
Pope John Paul II was the third longest-reigning pope in history at 26 years, behind Pope Pius IX who reigned for 31 years and Peter who ruled for 34 to 37 years.