Pope Saint Leo the Great

Feast November 10

Although he descended of a noble Tuscan family, Leo was born in the Eternal City. He was already known outside of Rome even as a deacon under Pope Celestine I, and had some relations with Gaul during this period.

During the pontificate of Pope Sixtus III, Leo was sent to Gaul by the Emperor Valentinian III to settle a dispute and bring about a reconciliation between Aëtius, the chief military commander of the province, and the chief magistrate, Albinus. This commission is a proof of the great confidence placed in the clever and able deacon by the Imperial Court.

While Leo was away in Gaul, the Pope died on August 19, 440 and the deacon-delegate was chosen as his successor.

Become the Pope

Returning to Rome, Leo was consecrated as Vicar of Christ on September 29 of the same year, and governed the Church for the next twenty-one years.

Whilst the Eastern Empire was distracted by heretical factions, the Western was harassed by barbarian hordes. Halted in his ruinous advance through Gaul by the Roman general Aëtius, Attila the Hun turned south into Italy. Leaving blood and desolation in his wake, he sacked Milan, razed Pavia and laid waste whole provinces.

The weak Emperor Valentinian III shut himself up in Ravenna, and the Romans, in the utmost terror, expected to see the barbarian invaders speedily before their gates. Such was the state of affairs when Pope Leo went to meet Attila.

Facing Barbarian Hordes

They found the proud tyrant near Ravenna and contrary to the general expectation he received the pope with great honor, gave him a favorable audience, and, at his suggestion, concluded a treaty of peace with the empire on the condition of an annual tribute. It is said that Attila saw two venerable personages, supposed to be the apostles Peter and Paul, standing on the side of the pope whilst he spoke.

The barbarian king immediately commanded his army to forbear all hostilities, and soon after recrossed the Alps, and retired beyond the Danube. On his way home “the Scourge of God” was seized with a violent vomiting of blood, of which he died in 453.

It was the glory of this saintly pope to have checked Attila’s fury and protected Rome, when it was in no condition to be defended. Pope Leo rose to its defense once again in the year 455, this time prevailing upon the Arian Vandal king Genseric to restrain his troops from slaughter and burning, and to content himself with the plunder of the city, thus demonstrating by his example that even in the worst of times, a holy pastor is the greatest comfort and support of his flock.

Vigilance Against Heresy

His militant vigilance was not limited to the defense of merely earthly treasures, but was above all active in the spiritual realm. Leo’s chief aim was to sustain the unity of the Church. Not long after his elevation to the Chair of Peter, he saw himself compelled to combat energetically the heresies which seriously threatened church unity even in the West.

Former adherents of Pelagius (who denied original sin and its effects and believed in man’s self-justification without grace) who had been admitted to communion without an explicit abjuration of their heresy were directed to do so publicly before a synod and to subscribe to an unequivocal confession of Faith.

He emphatically warned the Christians of Rome to be on their guard against the Gnostic teachings of the Manichæans who, among other tenets, denied the divinity of Jesus Christ, taught an elaborate form of dualism, professed salvation through knowledge and repudiated marriage as evil. His pastoral zeal in waging war against Manichæism was ably followed up by a number of imperial decrees and the edict of June, 445 establishing civil punishments for the obdurate adherents of the sect.

In Spain, the heresy of Priscillianism still survived, and for some time had been attracting fresh adherents. In response to a letter from Bishop Turibius of Astorga regarding the spread of its false teachings in his jurisdiction, Pope Leo wrote a lengthy refutation of its errors and ordered that a council of neighboring bishops should be convened to determine to what extent the heresy had contaminated the hierarchy of the surrounding provinces. He also called for a universal synod of all the main pastors in the Spanish provinces. These two synods were in fact held in Spain to deal with the Gnostic-Manichæan doctrines of the Priscillianists.

In 448, Eutyches appealed to the pope after he had been excommunicated by Flavian, the Patriarch of Constantinople, on account of his Monophysite views which denied the hypostatic union of Christ and the fact that Jesus was both fully God and fully man. In response, Pope Leo wrote a sublime dogmatic letter to Flavian, concisely setting forth and confirming the doctrine of the Incarnation, and the union of the Divine and human natures in the one Person of Christ.

Manifesting the Primacy of the Roman Church

In Leo’s conception of his duties as supreme pastor, the maintenance of strict ecclesiastical discipline occupied a prominent place. This was particularly important at a time when the continual ravages of the barbarians were introducing disorder into all conditions of life, and the rules of morality were being seriously violated. Leo used his utmost energy in maintaining this discipline, insisted on the exact observance of the ecclesiastical precepts, and did not hesitate to rebuke when necessary.

The primacy of the Roman Church was thus manifested under this pope in the most various and distinct ways and we cannot but admire the clear, positive, and systematic manner in which Leo, fortified by the primacy of the Holy See, took part in this difficult entanglement.

Leo was no less active in the spiritual formation of souls, and his sermons are remarkable for their profundity, clearness of diction, and elevated style. Five of these discourses, delivered on the anniversaries of his consecration, manifest his lofty conception of the dignity of his office, as well as his thorough conviction of the primacy of the Bishop of Rome.

Leo died on November 10, 461, and was buried in the vestibule of Saint Peter’s on the Vatican. In 688 Pope Sergius had his remains transferred to the basilica itself, and a special altar erected over them.

They rest today in Saint Peter’s, beneath the altar specially dedicated to St. Leo. In 1754 Benedict XIV exalted him to the dignity of Doctor of the Church.