Louis IX vs Louis IX of France

Louis IX and Louis IX of France both are nouns.

Word	Noun	Adjective	Verb	Adverb
Louis IX	Yes	No	No	No
Louis IX of France	Yes	No	No	No

As nouns, Louis IX and Louis IX of France are synonyms defined as:

Louis IX and Louis IX of France: king of France and son of Louis VIII; he led two unsuccessful Crusades; considered an ideal medieval king (1214-1270)

Other synonyms of Louis IX include Saint Louis, St. Louis.

Louis IX (noun)	Louis IX of France (noun)
king of France and son of Louis VIII; he led two unsuccessful Crusades; considered an ideal medieval king (1214-1270)	king of France and son of Louis VIII; he led two unsuccessful Crusades; considered an ideal medieval king (1214-1270)