Tarquin the Proud vs Tarquinius Superbus

Tarquin the Proud and Tarquinius Superbus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tarquin the Proud	Yes	No	No	No
Tarquinius Superbus	Yes	No	No	No

As nouns, Tarquin the Proud and Tarquinius Superbus are synonyms defined as:

Tarquin the Proud and Tarquinius Superbus: according to legend, the seventh and last Etruscan king of Rome who was expelled for his cruelty (reigned from 534 to 510 BC)

Other synonyms of Tarquin the Proud include Lucius Tarquinius Superbus, Tarquin, Tarquinius.

Tarquin the Proud (noun)	Tarquinius Superbus (noun)
according to legend, the seventh and last Etruscan king of Rome who was expelled for his cruelty (reigned from 534 to 510 BC)	according to legend, the seventh and last Etruscan king of Rome who was expelled for his cruelty (reigned from 534 to 510 BC)