old movie set during roman empire era

i don't remember much of the movie except the hero-protagonist was somehow caught by romans and probably fought in colosseum for freedom, at some point of this movie he tried to find his family members, only to find out they were dying of a serious disease in a cave due to an upcoming plague and so he abandoned them, i don't remember how the movie begins and how it ends, all i know is the movie is set somewhere during the roman empire age

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