The Catholic Church has had 266 popes since its inception in the 1st century A.D.Here we know the pope with the longest reign of all.
St. Peter
St. Peter, also known by the full name of Saint Peter the Apostle and as Cephas in AramaicHis Papacy began in AD 30 till AD 64–68 spanning nearly 37 years
POPE PIUS IX
Pope Pius IX is one of the most influential and controversial leaders of the Roman Catholic Church during his 32-year reign as pope, from 1846 to 1878.
JOHN PAULII
Pope John Paul II was an iconic leader who occupied the papacy from 1978 to 2005 nearly 26 years
LEO XIII
Pope Leo XIII (1810-1903) served as the head of the Catholic Church from 1878 to his death in 1903 (25 Years)
Pope Pius VI, born Giovanni Angelo BraschiHe was top of the Catholic Church from February 1775 to his demise in August 1799.
POPE PIUS VI
POPE PIUS VII
Pope Pius VII (1740-1823), having assumed office in 1800-1823, beheld some sympathy for the liberality desired by those advocating for the French Revolution.