Famous Makers of Arms and Armors and European Centers of Production – The Metropolitan Museum of Art https://www.metmuseum.org/essays/famous-makers-and-european-centers-of-arms-and-armor-production
Critical factors in the establishment and success of any such center were proximity to water (which would provide energy as well as transport routes) and the availability of metal either from nearby natural supplies or through trade.
Landshut, and Nuremberg, as well as the court workshop of the Holy Roman Emperors in Innsbruck