Pope St. Leo I, known as "St. Leo the Great," was pivotal in the fourth ecumenical council, where he played a crucial role in clarifying the dual nature of Christ—his divine and human natures. Believed to be of Tuscan descent, Leo was ordained as a deacon around 430 in Rome under Pope Celestine I. Between 432 and 440, during Pope Sixtus III's reign, he was sent on a diplomatic mission to Gaul by Emperor Valentinian III to mediate a conflict between military and civil authorities. In 440, Leo succeeded Pope Sixtus III as Bishop of Rome. Over more than two decades, he worked to safeguard the Church's unity and address various heresies affecting the Western Church, like Pelagianism, which denied Original Sin, and Manichaeanism. During this period, a debate arose among Eastern Christians about Jesus' humanity and divinity. As early as 445, Leo intervened in this conflict. Facing ongoing Christological controversies, Leo advocated for an ecumenical council, resulting in the Council of Chalcedon in 451, where his influence was strong among Eastern bishops, leading to the declaration that "Peter has spoken through the mouth of Leo." Leo taught that Christ’s divine nature did not negate his human nature, emphasizing the coexistence of both. In 452, he successfully negotiated with the barbarian king Attila to prevent an invasion of Rome and later confronted the Vandal leader Genseric in 455, gaining safety for many inhabitants. Pope St. Leo the Great passed away on November 10, 461, and was named a Doctor of the Church by Pope Benedict XIV in 1754. As noted by Pope Benedict XVI, Leo was one of the greatest pontiffs, significantly enhancing the authority and prestige of the Roman See.
Prayer:
O God, who never allows the gates of hell to prevail against Your Church, firmly founded on the apostolic rock, grant her, we pray, that through the intercession of Pope St. Leo, she may stand firm in Your truth and know the protection of lasting peace.
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