The town was founded in 42 BC as
Iulia Concordia by the
Romans, where the
Via Annia and the
Via Postumia crossed each other. The establishment of the
Diocese of Concordia dates from . The city was taken and destroyed by
Attila in 452 AD. After the fall of the
Western Roman Empire, it was part of the
Lombard duchy of
Cividale, and later became part first of the
March of Friuli and then the
Patriarchate of Aquileia. In 1420, together with all Friuli, it was annexed by the
Republic of Venice. In 1838, it was separated from Friuli to be included in the province of Venice. ==Main sights==