In the “Gradac” area where a torrential river Čezava flows into the Danube, by its left bank, 18km downstream from Golubac and 6km upstream from the village Dobra there are the remains of a Roman military fort which was a part of a Roman fortified military border on the Danube – limes. With some dilemmas it is most commonly identified with castrum Novae, which is mentioned in a few historical sources.
Archaeological research was made in the period between 1965 and 1970, but the entire locality hasn’t been explored. Due to PP Đerdap construction the level of the Danube increased, so that the fort was mostly sunk. The research results show that life on thos locality can be divided into seven periods. All of them lasted in the time span from the first half of I century AD, when the first wooden fort was built, and until VI century when in the time of king Justinian (527-565) an extensive restoration of big number of military strongholds was carried out. The fort suffered numerous modifications during the cited period, but its base kept its square form of 140 х 120m dimensions, with rounded corners and 14 towers which were altering their appearance and only to some extent changed their position.
In the last, seventh phase, in the northwest part of the fort, a single – nave basilica with a transept was built in the south side. Except the fort which had its lower town and a port, a medieval necropolis was discovered nearby the locality. It was formed in the period between XI and XIII century within the fort and in the space around and inside the basilica. Altogether 32 skeletons were then discovered.