The first contact of the Iasi with the Romans is attributed to the period of the latter's penetration to Segestica in 159 or 156 BC. After the repression of the major rebellion headed by Bato (6-9 AD), the Romans founded a military camp in the Daruvar basin, at the site previously occupied by the Iasian oppidum. Through the process of Romanization, the tribal civitas acquired the status of "Res Publica Iasorum". With the partition of Pannonia at the beginning of the 2nd century, it belonged to Pannonia Superior.