How many movies have Marcello Siena and Maurizio Zaccaro collaborated on?

They have worked on 3 movies together! Their first movie together was R.A.F. (Reperto Archeologico Filmico) (1979) while their highest rated movie together was La valle di pietra (1992). They have not worked together since La valle di pietra (1992). They are most known for their history films together.