Who was finally able to put a end to the gladiator fights?

The gladiator fights were ultimately ended by Emperor Constantine the Great in the early 4th century AD. He banned the practice as part of his broader reforms to promote Christianity and moral values within the Roman Empire. The growing disapproval of such violent spectacles among the Christian population also contributed to the decline of gladiatorial games. Thus, Constantine's reign marked the beginning of the end for these brutal contests.