Held der Gladiatoren (2003)

Germanus, a brave gladiator, witnesses the brutal murder of his brother, committed by another fighter. Since then, he will become his worst enemy, with whom he will fight in several fights, each more bitter. One day, Germanus discovers that his sister, also gladiator, maintains a passionate affair with the man who killed the brother of both, without her knowing anything about the crime

Unfortunately the movie Held der Gladiatoren is not yet available on HBO Max.