Salzburg, meaning fortress of salt, was a settlement in prehistoric times trading salt from the nearby salt mines. In Roman times it was called Juvavum, laying at the intersection of three major Roman roads. In 696 St. Rupert founded the bishopric, built St. Peter's church and founded the convent on Nonnberg. One century later Salzburg became an archbishopric and was ruled for many centuries by the prince-archbishops. In 1802 ecclesiastical rule ended and Salzburg was secularized. Wolfgang Amadeus Mozart (1756-1791) was born in Salzburg.