Leo I vs Leo the Great

Leo I and Leo the Great both are nouns.

Word	Noun	Adjective	Verb	Adverb
Leo I	Yes	No	No	No
Leo the Great	Yes	No	No	No

As nouns, Leo I and Leo the Great are synonyms defined as:

Leo I and Leo the Great: Italian pope from 400 to 461 who extended the authority of the papacy to the west and persuaded Attila not to attack Rome (400-461)

Other synonyms of Leo I include Pope Leo I, St. Leo I.

Leo I (noun)	Leo the Great (noun)
Italian pope from 400 to 461 who extended the authority of the papacy to the west and persuaded Attila not to attack Rome (400-461)	Italian pope from 400 to 461 who extended the authority of the papacy to the west and persuaded Attila not to attack Rome (400-461)