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An uncompromising foe of heresy, Leo found that in the diocese of Aquileia, Pelagians were received into church communion without formal repudiation of their errors; he wrote to rebuke this culpable negligence, and required a solemn abjuration before a synod.
Leo enforced his authority in 445 against Dioscurus, Cyril's successor in the patriarchate of Alexandria, insisting that the ecclesiastical practise of his see should follow that of Rome; since Mark, the disciple of Peter and founder of the Alexandrian Church, could have had no other tradition than that of the prince of the apostles.
In 444Leo laid down in a letter to them the principle that Peter had received the primacy and oversight of the whole Church as a requital of his faith, and that thus all important matters were to be referred to and decided by Rome.
PopeLeo XIII, born Vincenzo Gioacchino Raffaele Luigi Pecci (March 2, 1810 – July 20, 1903), was Pope of the Roman Catholic Church, having succeeded Pope Pius IX (1846–78) on February 20, 1878 and reigning until his death in 1903.
Leo XIII was also the first Pope to come out strongly in favour of the French Republic, upsetting many French monarchists, but his support for democracy did not necessarily imply his acceptance of egalitarianism: "People differ in capacity, skill, health, strength; and unequal fortune is a necessary result of unequal condition.
Leo XIII's regnal length was subsequently exceeded by that of Pope John Paul II on March 14, 2004.