There is no character named Cosimo, or at least there is no credited character by that name in Gladiator (2000). The closest names are Commodus, played by Joaquin Phoenix, Cicero, played by Tommy Flannagan, and Cassius, played by David Hemmings.
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Oliver Reed's final role was in the film Gladiator. He played Proximo, an elderly slave dealer.
Joaquin Phoenix
My words are weapons
Why did you fight as a gladiator