Leo the Great vs St. Leo I

Leo the Great and St. Leo I both are nouns.

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

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

Leo the Great and St. Leo I: 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 the Great include Leo I, Pope Leo I.

Leo the Great (noun)	St. Leo I (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)