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Road junction, already inhabited in Celtic times, with a crossing of the river Traun, modern Wels. Occupied after the incorporation of Noricum into the Roman Empire; municipium (CIL III 11785b; IX 2593) under Hadrian, colonia Aurelia Antoniniana (CIL III 5630; CSIR III 3, 1981 ) under Caracalla . It is disputed whether O. was the civilian capital city of Noricum Ripense . Several centres of habitation formed within the walls of O. in the 7th/8th cent. (castrum Ueles fortified in 776).