Leonidas I vs Leonidas

Leonidas I and Leonidas both are nouns.

Word	Noun	Adjective	Verb	Adverb
Leonidas I	Yes	No	No	No
Leonidas	Yes	No	No	No

As nouns, Leonidas I and Leonidas are synonyms defined as:

Leonidas I and Leonidas: king of Sparta and hero of the battle of Thermopylae where he was killed by the Persians (died in 480 BC)

Leonidas I (noun)	Leonidas (noun)
king of Sparta and hero of the battle of Thermopylae where he was killed by the Persians (died in 480 BC)	king of Sparta and hero of the battle of Thermopylae where he was killed by the Persians (died in 480 BC)