As early as in the 4th century Celts settled on the site of today’s Salzburg. Under the Romans it was called Juvavum. Shortly before 700 St. Rupert founded the See of Salzburg, in the following century it became an archbishopric. In the 13th century the bishops received the title of Princes of the Holy Roman Empire. Within the next 50 years they changed Salzburg into a residential town of Italian character.