Leo I

American

[lee-oh, le-aw] / ˈli oʊ, ˈlɛ ɔ /

noun

Saint, Leo the Great, a.d. c390–461, Italian ecclesiastic: pope 440–461.

Leo I British

/ ˈliːəʊ /

noun

Saint, known as Leo the Great. ?390–461 _ad , pope (440–461). He extended the authority of the papacy in the West and persuaded Attila not to attack Rome (452). Feast day: Nov 10 or Feb 18

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Leo I

The pontiff of the time, who persuaded Attila to turn his army back and spare Rome, was called Pope Leo I.

From Los Angeles Times ● Apr. 13, 2026

According to legend, the miraculous apparition of Saints Peter and Paul during the meeting between Pope Leo I and Attila the king of the Huns in 452 AD made the latter desist from invading Italy.

From BBC ● May 9, 2025

“It’s an enormous accomplishment for Leo, I have to acknowledge that.”

From Washington Times ● Oct. 23, 2022

Then, in May 1982, Leo, I and our two mongrels, Mabel and Barbara, were invited to Longleat for the weekend.

From The Guardian ● Jan. 1, 2019

And even though I suspected Zara just didn’t want me to report Leo, I couldn’t imagine telling all this to Mr. McCabe, anyway.

From "Maybe He Just Likes You" by Barbara Dee

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023