Ballymote Castle is a large rectangular keepless castle, built around 1300. It is located in the townland of Carrownanty on the outskirts of Ballymote. It is the last of the Norman castles in Connacht. It was probably built in order to protect the newly won possessions of Richard Óg de Burgh, 2nd Earl of Ulster (also known as the Red Earl), in County Sligo, some distance from an earlier motte.
Ballymote castle is a large enclosure castle, the most symmetrical of all the Irish 'keepless' castles. It has many similarities with Beaumaris Castle, in Anglesey, Wales, built by King Edward I of England. The entrance, with a double towered gate, is in the north wall and had twin D-shaped towers. It has a gatehouse typical of the period, the outer portions of which have almost completely disappeared. The castle, however, remains an impressive structure. The interior measures about 30 square metres. There are three-quarter round towers at all four corners and also in the middle of the east and west walls. A postern gate, which was planned for the centre of the south wall, was never completed, probably because of the events of 1317, when the castle was lost to the O'Connors. A small square tower had protected this gate.
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.