Gladiator was a person who, in ancient Rome, fought with another person or animal, sometimes to the death, for the entertainment of the Roman public. The origin of the combats between gladiators is probably Etruscan, initially carried out to honor some men in their funerals, receiving the name of munus, restricted to members of the Roman elite, the first report dates from 264 BC, in Rome.
Over time, the presentations were made available to the general public in the amphitheaters, the first being built of wood, such as the one in Pompeii, in 70 BC, after which several others were built by the empire, including the largest among them, the Flavius amphitheater (Roman Coliseum), built in 80 AD, which could hold between fifty thousand and eighty spectators from all layers of Roman society.
Of this content, the only ones that actually are Gladiators are Spartacus and Maximus. Achilles and Leonidas were Greeks but still great warriors.