The site Diana is situated at the Danube bank about 2 km downstream from the hydroelectric power station Đerdap I, by the road Tekija – Kladovo. It is considered to be one of the largest and best preserved military fortifications on the Upper Moesian limes. The camp was in use from the 1st to the 6th century. First small-scale excavations were carried out in 1964 and 1965. Couple of years later, in 1971 and 1972 the investigations were resumed and in 1978 large systematic excavation that are still in progress have started. The construction of the first camp was taken when first troops arrived in this area at the beginning of the 1st century, and second was when the millitary interest focused on the Danube in the middle of the same century. The constitution of the first stone fortification dates from the end of the 1st and the begininng of the 2nd cenruty, in the regin of emperor Trajan. This fortification was of almost square plan (140x134m). Late Roman period, that is the transition from 3rd to the 4th century witnessed significant architectural alterations of the fortification. The final phase of the fortification dates from the time of emperor Iustinian, i.e. the 6th century.