Pope Leo XIV calls for binding AI regulation in first encyclical
Rule ChangesVatican pairs with Anthropic to push global rules on artificial intelligence
May 25th, 2026: Encyclical released at the VaticanNew here? Follow stories to track developments over time. Create a free account to get updates when stories you care about change.
Overview
Updated May 26Pope Leo XIV signed his first encyclical on May 15, 2026, 135 years to the day after Pope Leo XIII published Rerum Novarum. Magnifica Humanitas calls AI the next industrial revolution and demands binding external regulation of the companies building it.
Leo presented the document at the Vatican on May 25 alongside Anthropic co-founder Christopher Olah. Bishops' conferences in the United States, Canada, England, and Wales issued welcome statements within hours. The Church now backs one AI lab cut off from U.S. federal contracts: Anthropic opened a Milan office and CEO Dario Amodei has a late-May UK government visit scheduled.
Why it matters
The Catholic Church just placed its 1.4 billion-member moral authority behind binding AI rules, including a ban on machines making lethal decisions.
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People Involved
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The central governing body of the Roman Catholic Church and a sovereign actor in international law.
AI lab founded in 2021 by former OpenAI researchers; builds the Claude family of models with a stated focus on safety.
Timeline
May 1891 May 2026
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Encyclical released at the Vatican
Latest Public releaseLeo presents the document at Synod Hall with Anthropic co-founder Chris Olah. Calls for binding regulation and a ban on AI making lethal decisions.
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U.S. and international Catholic bishops issue welcome statements
Institutional responseArchbishop Paul Coakley, USCCB president, called the encyclical "a powerful reminder that no technology can replace a child of God." The Canadian Conference of Catholic Bishops and the Catholic Bishops' Conference of England and Wales issued parallel statements the same day.
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Pope signs Magnifica Humanitas
Document signingLeo signs his first encyclical on the 135th anniversary of Rerum Novarum, deliberately tying AI to the industrial revolution.
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Trump administration bars federal agencies from using Anthropic
Government actionOrder follows Anthropic's refusal to give the U.S. military unrestricted access to its models. Sets stage for the company's later alliance with the Vatican.
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Robert Prevost elected Pope Leo XIV
ElectionChicago-born cardinal becomes the first American pope. In early remarks, he signals AI will be a defining theme of his papacy.
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Pope Leo XIII publishes Rerum Novarum
Historical precedentLeo XIII issues the encyclical that defined Catholic teaching on workers, capital, and the industrial revolution.
Historical Context
3 moments from history that rhyme with this story — and how they unfolded.
Rerum Novarum (1891)
Pope Leo XIII published Rerum Novarum, addressing the industrial revolution. He defended workers' right to fair wages, condemned both unrestrained capitalism and revolutionary socialism, and argued that the state has a duty to regulate employers in the common interest.
The text became the foundation of modern Catholic social teaching. It legitimized Catholic labor unions across Europe and Latin America.
Its framework shaped welfare-state debates for more than a century and is still cited by Catholic legislators when arguing for labor protection.
Leo XIV signed Magnifica Humanitas on Rerum Novarum's 135th anniversary and took his papal name from its author. The deliberate parallel frames AI as a comparable break in how humans organize work and power.
Pacem in Terris (1963)
Pope John XXIII issued Pacem in Terris six months after the Cuban Missile Crisis. The encyclical called for nuclear disarmament, addressed itself to all people of goodwill rather than just Catholics, and argued that the arms race was incompatible with human dignity.
The text was read into the U.S. Congressional Record and praised by President Kennedy. It influenced the 1963 Limited Test Ban Treaty signed three months later.
It set a model for papal intervention in global security policy and laid groundwork for later Vatican advocacy on nuclear non-proliferation.
Leo XIV's call to 'disarm' AI directly echoes Pacem in Terris. Both encyclicals address a new class of technology whose worst use is the automated taking of human life.
Laudato Si' (2015)
Pope Francis issued Laudato Si' on the environment and climate change. The encyclical linked ecological destruction to economic structures that concentrate wealth and power, and called for binding international action.
It was credited with shifting climate diplomacy ahead of the Paris Agreement adopted in December 2015.
Catholic dioceses and investors used it to justify fossil-fuel divestment. National climate laws in Catholic-majority countries have cited it in preambles.
Laudato Si' is the closest recent template for what Magnifica Humanitas could become: a moral document that helps tip a regulatory debate already in motion.
