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:Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.