The most ancient traces of settlements in the area of today's Adamklisi are dated to the period of the Geto-Dacian culture, around the IV-II century BC. In the winter of 101 – 102, a major military clash took place here between the Dacian army of Decebalus and the Roman legions of Trajan, which ended in a Roman victory. Colonized with Roman veterans of the Dacian Wars, the city was the largest Roman municipality of Minor Scythia by 170. Destroyed by the Goths, it was rebuilt during the reign of Constantine the Great with better defensive walls, until the Avars burned it in 587. After that time it ceased to be among the important cities of Dobrudja and is not mentioned in the sources for about seven hundred years.