Ancient Fortress Bononia and Medieval and Ottoman Fortress Bdin (Vidin)

 fortification, invisible, historical layer / disappeared object

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Bononia came to life in the late 1st-ear­ly 2nd century as a castle and road sta­tion of the Roman province of Moesia. It is located on the high right bank of the Danube. It is most likely that a military auxiliary troop building the Danube road was deployed in this place. In the 2nd–3rd century, the city flourished and the port served the Danube and merchant navy.
Towards the late 3rd-early 4th century the ancient city had a solid fortification sys­tem, which placed it among the big urban centres of the Empire. The city had the shape of a rectangle extending north-south with an area of about 20 ha. The length of the northern wall was about 365 m and of the west - about 600 m. Archae­ologists have uncovered 9 round towers with a diameter of 19 m and wall thick­ness of 3.7 m. Ancient Bononia was cap­tured and destroyed by the Avars in the 6th century.

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