How many movies have Franz Porten and Rudolf Klein-Rogge collaborated on?

They have worked on 2 movies together! Their first movie together was Der Film von der Königin Luise - 2. Abteilung: Aus Preußens schwerer Zeit (1913) and was their highest rated movie together. They have not worked together since Der Film von der Königin Luise - 1. Abteilung: Die Märtyrerin auf dem Königsthron (1913).