Fortification Wall of Nebet

On the northern slopes of Nebet hill there are some of the best preserved remains of the fortress walls. Here the wall is 25 meters and has a height of 2.5 to 3 meters. The outer wall is built of large blocks with a rough face, linked to the depth of the joints with plenty of red mortar1. Some of the rocks have been used before, as evidenced by their earlier treatment for other purposes. Here there has being a discovery of a hidden entrance (postern) in  the fortress wall that leads down a rocky cliff to the bottom of the hill. The facility comprises a vaulted staircase corridor. The staircase itself occupies the entire width of the corridor. The ruined arch was restored. The construction of this interesting sector of the fortress wall with the secret input can be assigned to the III—IV AD.

1Mortar –  is a workable paste used to bind building blocks such as stones, bricks, and concrete masonry units together, fill and seal the irregular gaps between them, and sometimes add decorative colors or patterns in masonry walls. (Source: Wikipedia)

Fortress entrance at the southern slopes of the hill Dzhambaz

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Over the southern entrance of the tunnel that passes through the Three Hills, the ruins of the fortress walls of the old Philippopolis rises.
In the foreground there is a fortress wall, build with large stone blocks laid directly onto the rocky terrain. The 2 m wide wall is intersected by an interesting fortress entrance included in a large complex of other fortified facilities. It leads as a long corridor deep into the very slope of the hill. The size of the entrance and its location have determined it to have been a secret outlet for special purposes. By the way of construction and its location it is assumed that this sector of the fortress wall with a secret entrance, was built in the Late Hellenistic Period, ie around III BC.

Fortress wall at the northern entrance of the tunnel

Over the entrance of the tunnel, an interesting sector of the old Plovdiv fortress is preserved. The construction of the tunnel intersected its length and today on both sides there are large stone blocks. It is assumed that the bottom of this sector fortress was built in the era of the Roman rule in Thrace.
The construction consists of pebbles cemented with white mortar, which indeed are lined with hewn stone blocks, while the inside – with tufeli. The stone blocks of the outer cladding are different sizes and are arranged transversely and longitudinally in horizontal rows.
This fortified sector has undergone later amendments. The remains of the old wall served as the plinth of the new building and are lined with tufeli on the outside and inside. The solder – red mortar.
This rectification of the wall was probably made during the period of late antiquity, i. E. IV—V AD.

Fortress entrance Hisar kapiya

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… On both sides, the entrance of the wall is flanked by square towers. Beneath the altar of the church “St. St. Konstantin and Elena” there were the foundations of the right turret, and the left one lies in the foundations of today’s building of the Ethnographic Museum. Three meters below the steep cobbled street that runs in Hisar kapiya, are the foundations of an even older castle.
It is assumed that the structure and method of construction of the Fortress sector Hisar kapiya was erected during the early Byzantine rule over Philippopolis, or more precisely around V—VI AD.

Fortress sector “The round Tower”

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Archaeologists for the first time had the opportunity to penetrate to the Old Town in a very original way – through the back entrance of a round tower on “Stramna” str.
The tower was built exactly on a vulnerable spot of the fortress wall, where it makes a bend according to the terrain profile. This cupola flanked the endangered corner of the fortress and its main eastern entrance Hisar kapiya, which is located just an arrow away. In the tower, significant part of the inner face of the city wall that runs through the yard of the church “St. St. Konstantin and Elena” were traced.