Sokolac Castle back to medieval times, while the town was held by the noble Frankopan and Gorjanski families. The castle was part of an important medieval fortified city held by Frankopan family. The cast was documented first time in 1411.
Sokolac Castle was an extremely grand building, dominated by the powerful perpendiculars of the entry tower, and the Chapel of the Holy Trinity. The entry into the burg was through a square, three-storey tower, the façades of which were relieved with lesenes linked at the top with blind arcades, making it a unique specimen in the whole of Central Europe.
References:The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.