Italienzug
An Italienzug (also known as Romfahrt or Romzug in German, or as expeditio italica in Latin) was the expedition undertaken by an elected king of the Romans to be crowned by the pope as Holy Roman Emperor in the city of Rome. Prior to the reforms of Frederick Barbarossa, the kings of the Romans struggled to muster an army for the expedition, for they needed the formal approval of the Reichstag.