The remains of Roman military caste Dimum are located in the northern part of town of Belene. In the 1st century AD Dimum was a very important point of the Roman province of Moesia. Even during the regime of the first Roman Emperor Augustus the fortress was the most north-eastern point and boundary of the Roman province of Moesia and the Thracian kingdom.
From the beginning of the 2nd until the end of 3rd century here was stationed military horse camp - part of the Roman army, which probably has built the fortress.The site was repeatedly studied by archaeologists. During excavations in 1989 was studied the fortification system of the caste and it was discovered preserved part of it that is long about 60 meters. In 1990 there was found the south tower of the western fortress gate - gate Pretoria. Among the findings are also walls of two buildings (one from the late antiquity and other from an earlier period) and floor of a medieval house.In a castle the archaeologists were found many objects and artifacts dating from different periods - early and late antiquity, early and late Middle Ages, the Ottoman period. Among the finds are a bronze statuette of the goddess Demeter (Isida), bronze ornaments and applications, glass bracelets, home tools and objects, copper coins and more.
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.