The Papacy & the Magisterium

Peter, the Rock

Among the twelve apostles, Jesus singled out Simon for a unique role: "You are Peter, and on this rock I will build my church, and the gates of hell shall not prevail against it. I will give you the keys of the kingdom of heaven" (Matthew 16:18–19). The keys evoke Isaiah 22:22, where a steward is given authority to act in the king's name during his absence. After the Resurrection, Christ entrusts Peter specifically with feeding His flock — "Feed my lambs... Tend my sheep... Feed my sheep" (John 21:15–17). Catholics see in this the founding of a lasting office, not just a personal privilege for one man (CCC 552–553, 881).

Apostolic Succession

The apostles, in turn, appointed successors and passed on their authority through the laying on of hands (2 Timothy 1:6, Titus 1:5) — a practice the early Church continued without interruption. Every validly ordained Catholic bishop today stands at the end of an unbroken chain of ordination reaching back to the apostles. This is what "apostolic succession" means: not a claim about personal holiness, but about a real, traceable transmission of teaching authority and sacramental power (CCC 77, 861–862).

The Pope as Bishop of Rome

The Pope's authority flows from his office as Bishop of Rome — the local church where Peter, by ancient and constant tradition, was martyred and buried. From the earliest centuries, other churches looked to Rome's bishop for a decisive word in disputed questions, precisely because he sat, literally, in Peter's chair (the origin of the phrase cathedra Petri, "the Chair of Peter"). The Pope is called the Vicar of Christ and Successor of St. Peter, and serves as the visible source and foundation of unity for the whole Catholic Church (Lumen Gentium, 23) (CCC 882).

Pope Leo XIV, the 267th Pope

On May 8, 2025, on the second day of the conclave that followed the death of Pope Francis, the cardinals elected Cardinal Robert Francis Prevost, O.S.A. He took the name Leo XIV. Born in Chicago on September 14, 1955, he is the first Pope from the United States and the first from the Order of St. Augustine. He also holds Peruvian citizenship.

• Priest and missionary. He entered the Augustinians in 1977, was ordained a priest in Rome in 1982, and earned a doctorate in canon law. He then served for more than a decade as a missionary in Peru, as a parish priest, seminary teacher, and formator of young Augustinians.
• Leader of his order. He served as Prior General of the Augustinians worldwide from 2001 to 2013.
• Bishop. Pope Francis sent him to the Diocese of Chiclayo, Peru, first as apostolic administrator (2014) and then as its bishop (2015–2023). In 2023 he was called to Rome as Prefect of the Dicastery for Bishops and created a cardinal.
• His name. He explained to the cardinals that he chose “Leo” mainly because Pope Leo XIII, in the encyclical Rerum Novarum (1891), addressed the social question raised by the industrial revolution. Today the Church faces another revolution, in artificial intelligence.
• His motto. In Illo uno unum, “In the One, we are one,” is from St. Augustine, speaking of the unity of Christians in Christ.

His principal documents so far (as of October 2026) are:

• Dilexi te (October 2025), an apostolic exhortation on love for the poor, completing a text begun by Pope Francis.
• In unitate fidei (November 2025), an apostolic letter for the 1,700th anniversary of the Council of Nicaea. It was published before his first apostolic journey, to Turkey and Lebanon.
• Magnifica humanitas (May 2026), his first encyclical, on the dignity of the human person in the age of artificial intelligence. It is dated May 15, the 135th anniversary of Rerum Novarum.

All of his documents are published on the Holy See’s website. Every Mass prays for him by name in the Eucharistic Prayer: “…together with Leo our Pope and N. our Bishop.”

The College of Bishops

The Pope does not govern the Church alone. Together with the bishops in communion with him — each shepherding his own diocese, and collectively responsible for the whole Church — he forms the "college of bishops," the continuation of the apostolic college that once surrounded Peter (CCC 880, 883). Ecumenical councils, gatherings of the world's bishops with the Pope, are the fullest exercise of this shared teaching authority; see the Ecumenical Councils page for the twenty-one the Church recognizes.

What infallibility means

Infallibility is one of the most misunderstood Catholic teachings. It does not mean the Pope cannot sin, cannot make mistakes, or is always right about everything he says. It means, narrowly and specifically, that when the Pope solemnly defines a teaching on faith or morals for the whole Church — speaking ex cathedra, "from the chair" — the Holy Spirit preserves that definitive teaching from error (CCC 889–891). This charism has been invoked explicitly only a small handful of times in Church history, most recently for the dogma of the Assumption in 1950. The same protection from error extends to the "ordinary and universal Magisterium" — what the bishops of the whole world, together with the Pope, consistently and definitively teach as belonging to the faith across time.

What it does not mean

A Pope's private opinions, interviews, off-the-cuff remarks, and even most formal documents are not covered by the guarantee of infallibility, and his judgments on disciplinary or prudential matters can be mistaken. But "not infallible" does not mean "optional." When the Pope or the bishops in communion with him teach on faith and morals in their ordinary Magisterium, without defining a doctrine, Catholics owe that teaching a "religious submission of mind and will" (Lumen Gentium, 25; CCC 892). Its weight depends on the kind of document, how often the teaching is repeated, and the way it is expressed. A homily or an interview carries far less weight than an encyclical. Discerning the weight of a given teaching is part of a mature Catholic education.

Scripture and Tradition together

The Magisterium does not stand above the Word of God — Scripture and Sacred Tradition together — but serves it, "teaching only what has been handed on" (Dei Verbum, 10). Its task is to guard, interpret, and hand on faithfully what the apostles received from Christ, not to invent new revelation (CCC 85–86). See the related question in Apologetics on the biblical basis for the Pope, and how the Bible's own canon came to be recognized by that same teaching authority.

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