Washington, D.C. Newsroom, Nov 10, 2025 / 13:25 pm

Throughout the last two millennia, the Catholic Church has only granted the title “doctor of the Church” to 38 saints, one of whom we celebrate today on Nov. 10: St. Leo the Great, the 45th bishop of Rome.

Pope Leo I, who was the first pope to be remembered posthumously as “the great,” began his papacy in 440 and served until his death in 461. During his pontificate, he worked to clarify doctrines related to Christ’s human and divine natures.

The pontiff was a “pope-theologian, but he’s also known as a remarkable bishop,” Thomas Clemmons, a professor of Church history at The Catholic University of America, told CNA, adding that “theologian popes are rare.”

St. Leo’s papacy began nine years after the Council of Ephesus, which condemned

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