Amore e sangue (released in the U.S. as "City of Violence"), the 1951 Marino Girolami (billed as "John Wolff") West German/Italian romantic action adventure war thriller.
In the prison of San Vittore there is, among other detainees, a strange type that they call "Il Cavaliere". The latter suffers a conviction for theft and his fellow prisoners have a certain respect for him.