The keep of the medieval Matochina Fortress

The Matochina Fortress (Маточинска крепост, Matochinska krepost), also known as Bukelon (Букелон), lies on a plateau to the northeast of the village itself. Bukelon was reportedly mentioned in reports about the Battle of Adrianople of 378. The only well-preserved part of the castle today is the inner fortress with the keep, which is 18 metres (59 ft) in height and dates to the 12th–14th century. The keep is a three-storey tower with arrow loops on all sides. The third storey was reportedly used as a chapel for the defenders. The keep was constructed out of stone and bricks. A cross-shaped brickmonogram to the side of the entrance indicates that the fortress may have been reconstructed by Tsar Michael Shishman of Bulgaria (1323–1330).^[3][4]The keep is rectangular in shape with two protruding parts, one of which is semicylindrical. The Matochina Fortress was part of Adrianople's defensive system and protected the city from the north.^[5]

• http://en.wikipedia.org/wiki/Matochina