Next to the plant ornaments, based on the thorough observation of nature and found in all three places, and next to the many matching architectural details, identical stonemason's marks recently found in Iben, Naumburg and Meissen support the evidence. The migration of the building workshop of the Naumburg Master, from Northern France over the Middle Rhine area up to the eastern boundaries of the German Empire and further on to southwestern Europe, reflects the extensive European cultural exchange during the High Middle Ages.