The Invincible Gladiator
Il gladiatore invincibile (original)
Starring Richard Harrison, Luisella Boni, Livio Lorenzon, Leo Anchóriz, Edoardo Nevola, José Marco, Jole Mauro, Ricardo Canales, Antonio Molino Rojo, Giorgio Ubaldi
It's a drama and action & adventure movie, and has a rating of 5.6 out of 10 from Imdb which is fairly okay for this kind of movie.
Watch it here
Not found streaming from Germany.