How many movies have Arrigo Boito and Francesco Maria Piave collaborated on?

They have worked on 8 movies together! Their first movie together was Verdi: Simon Boccanegra (1978) while their highest rated movie together was Verdi: Simon Boccanegra (2018). They have not worked together since Verdi: Simon Boccanegra (2018). They are most known for their music films together.