Flavius Maximus

From Memory Alpha, the free Star Trek reference

Flavius Maximus was a Roman of the planet 892-IV, the most popular and successful gladiator of his time. He rejected the Roman way of life and converted to the Children of the Son, a sect that preached equality, compassion and the teachings of the Son of the one true God.

In 2268, he was captured and forced to fight again, on the televised arena game Name the Winner!. He was killed trying to prevent the execution of Enterprise Captain James T. Kirk. (TOS: "Bread and Circuses").

Flavius was played by actor Rhodes Reason.