Concordia Sagittaria is a town and comune in the Metropolitan City of Venice, Veneto, Italy. The town was founded in 42 BC as Iulia Conco…Concordia Sagittaria is a town and comune in the Metropolitan City of Venice, Veneto, Italy. 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 c. 380 AD. The city was taken and destroyed by Attila in 452 AD.