The crossword solution for the term 'CAESAR SUPPORTER'S FULL FIRST NAME' is Marcus, which is a 6-letter Latin name. Marcus was a Roman praenomen, or given name, which was popular during the Roman Republic and the early Roman Empire. It was the name of several prominent figures in Roman history, including Marcus Tullius Cicero, a Roman statesman, lawyer, political theorist, and philosopher. Marcus Antonius, also known as Mark Antony, was a Roman politician and general who supported Julius Caesar and was an important figure in the events that led to the demise of the Roman Republic.