St. Leo I

9.1

An Italian pope in the 400s who strengthened the pope's power and persuaded Attila not to attack Rome

proper noun

: San León I

St. Leo I is remembered for negotiating with Attila the Hun to save Rome.

Examples

The leadership of St. Leo I strengthened the position of the papacy in Western Europe.
Historians regard St. Leo I as one of the most influential popes of the early Church.
Pope St. Leo I played a crucial role in the history of the Church.
Did St. Leo I really convince Attila the Hun to spare Rome?
St. Leo I is remembered for negotiating with Attila the Hun to save Rome.
Historians regard St. Leo I as one of the most influential popes of the early Church.
The leadership of St. Leo I strengthened the position of the papacy in Western Europe.

Synonyms

Leo I

vsSt. Leo I

1 9.6

Pope from 440 to 461 who convinces Attila the Hun not to attack Rome

uses an abbreviated honorific and a numeral in the name instead

Leo the Great

vsSt. Leo I

1 7.4

A pope in the 400s who persuaded Attila the Hun not to attack Rome

uses an abbreviated honorific and a numeral in the name instead

Surface Forms

St. Leo I main

Morphology

St. + Leo + I

The phrase is fully compositional: 'St.' is the abbreviation for 'Saint', 'Leo' is a personal name, and 'I' is the Roman numeral for 'the First', so a learner who knows these parts will understand it denotes Saint Leo the First. It does not encode the biographical details (e.g., pope, dates), but the referential identity is transparent and follows common naming conventions across languages.

Etymology

St. Leo I comes from a pope in the 400s who met Attila the Hun and helped save Rome. The St. part means a holy 'saint' and Leo is a Latin word for 'lion', so his brave, strong action is why people remember him as 'the Great'.