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Pope Leo Declares Just War Obsolete, AI Regulation, Slavery Apology

5/28/2026

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Pope Leo declared medieval just war doctrine outdated in his encyclical Magnifica Humanitas, released on Monday, May 28, 2026.
He called for worldwide regulation of AI systems and apologized for the Church’s historic support of transatlantic slavery.
Cardinal Blase Cupich said the doctrine was meant as a restraint, not a slip for war.
Scholars noted that St. Augustine’s criteria still guide curricula at U.S. military academies such as West Point.

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Story summary

Pope Leo declared medieval just war doctrine outdated in his encyclical Magnifica Humanitas, released on Monday, May 28, 2026.
He called for worldwide regulation of AI systems and apologized for the Church’s historic support of transatlantic slavery.
Cardinal Blase Cupich said the doctrine was meant as a restraint, not a slip for war.
Scholars noted that St. Augustine’s criteria still guide curricula at U.S. military academies such as West Point.