The remains of a late antique fortification at the site of Prisjanica, on the part of the Mihaljevačka forest near Čortanovaci, where sounding tests were carried out in the 1960s. On that occasion, the southeastern corner of the tower with a diameter of 13 m, thickness of walls 1.20 m and a preserved height of about 3 m, built of stone, with intermediate rows of bricks, was investigated. The tower has been preserved, but the remains, overgrown in the forest, are barely visible today. The part of the southern wall with the entrance gate flanked by two half-towers was fully explored. The entire fortification with parts of the road and the cemetery collapsed during the landslide above the Danube, with a length of about 5 km and a width of 1 km. The ancient name is not known. In the literature, it is often associated with the Roman fortress Ad Hercule.
Ad Herculem (lat. Ad Herculem; literally Hercule) was a Roman fortification located in the Pannonian part of the Danube Limes. According to the “List of Dignities” (lat. Notitia Dignitatum), the crew consisted of “Herculean” auxiliary units (lat. auxilia Herculensia).
The movable archaeological material collected during the excavation indicates that the fort existed from the 1st to the 4th century. Judging by the emissions and the flow of money, the collapse of the camp could have happened around the year 370, after which it was completely abandoned. In the wider area towards the Čortanovci settlement, a Roman necropolis and the remains of a rustic villa have been recorded. The most significant hoard of Roman coins was found in 1932, which contains about 2,300 pieces of bronze and silver coins. The location of Prisjanica near Čortanovaci was categorized as a location of great importance for the Republic of Serbia in 1991.