A battle took place around Rusokastro fortress, which was the last great medieval victory of the Bulgarians over Byzantium before the fall of Bulgaria under Ottoman rule. On 18.07.1332, Tsar Ivan Alexander defeated Emperor Andronicus III at the fortress of Rusokastro. The fortress has an area of 52 decares, making it the second largest after the fortress of Tsarevets. The excavations have been completed up to date. The ruler's tower, the barracks, the entrance to the fortress with the three gates, one of which is a “cataract” type, the passage with a tower-well have been uncovered.