Capa Kaliakra Bulgaria May 2011. The cape stretches 2km deep into the sea and consists of 60-70m-high limestone rocks, the inaccessibility of which has been the main reason for the construction of an ancient fortress named Tirisis there. The fortress was successively used by Tracians, Romans, Byzantines and Bulgarians. According to legends, the fortress was guarding the treasuries of Lyzimah, successor of Alexander the Great. Today there are quite many remains of those ancient settlements, which can be seen exhibited in a small museum. One can also read there a legend telling the story of several Bulgarian girls who chose to jump from the high cape into the sea but not to be captured and converted to Islam by the Turks. The Battle of Cape Kaliakra was the last naval battle of the Russo-Turkish War of 1787-1792. It took place on 11 August 1791 off the coast of northern Bulgaria in the Black Sea. Neither side lost a ship, but the Ottomans retreated to Istanbul afterwards.