Pope Leo I

Reign: 440 – 461
Life: 400–461

He is the first of the three Popes listed in the Annuario Pontificio with the title "the Great", alongside Popes Gregory I and Nicholas I. He is also a Doctor of the Church, most remembered theologically for issuing the Tome of Leo, a document which was a major foundation to the debates of the Council of Chalcedon, the fourth ecumenical council. That meeting dealt primarily with Christology and elucidated the definition of Christ's being as the hypostatic union of two natures, divine and human, united in one person, "with neither confusion nor division". It was followed by a major schism associated with Monophysitism, Miaphysitism and Dyophysitism.

During Pope Leo I's reign, Merovech ruled France, Emperor Wen of Liu Song ruled China, and Emperor Ingyō ruled Japan.

Want to learn more? Further reading

Absolute Monarchs: A History of the Papacy by John Julius Norwich

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The World During Their Reign

The most notable rulers who held power elsewhere at the same time, from European courts to Ottoman, Mughal, and Chinese thrones.

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From the library

Go deeper on Pope Leo I

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Absolute Monarchs: A History of the Papacy

John Julius Norwich

Norwich's narrative history of the popes, from Saint Peter's successors to the modern Vatican.

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Saints and Sinners: A History of the Popes
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