The two main buildings of the Palace architectural group take the most representative place in the Inner town of the Second Bulgarian capital. The frames of the complex are the Big palace also called the Throne chamber on the east and the Small palace also called residential one on the west. They are connected through a three section building. The Representative building on the south of the Small palace and the Ruler’s basilica on the east are also part of the complex. The town structure between the buildings is filled with squares, made of massive limestone plates. Parts of the water and sewage system are made underneath. There is a street leading to the central entrance on the north of the Throne chamber connecting it with the northern gate.
The main building in the architectural group is the Throne chamber. The building erected during the capital period is rectangular planned, 35 m. long and 22 m. wide, directed towards north- south. The main building consists of a ground floor and an upper floor. The ground floor is divided in two parts- northern and southern. The northern one has an entrance hall divided in three rooms. This used to be the official entrance and stairs connected it with the main hall on the second floor. The southern part is divided by longitudinal walls of the main room, each flanged by four rectangular rooms. The middle longitudinal wall supports the floor of the main hall. The throne hall used to be rectangular planned divided in three by colonnades forming two side corridors. In view of the northern entrance most probably the ruler’s throne is situated on the south of the central place. The palace used to be 22 m. high. Remarkable samples of decorative stone plastics were found during the building’s research: bases, columns, capitals, cornices, etc.
The three- section monumantal building starts from the northwestern corner of the Big palace to the Small palace. Its façade appears to be continuation of the northern façade of the Throne palace. The building used to secure the covered bridge between the two main buildings.
The residential complex is situated in the western and highest part of the Palace complex. The building is rectangular planned and north- south directed in its ground part. Its main part is constructed over remains of a building of the pre- capital period finishing with semicircular niche on the south. It is possible it used to be a residence of the commander of the military camp which used to be here. There used to be a massive stone wall around the early building. During one of the reconstructions in the northern part of the new façade an entrance with a door way on the north was made and there was stair case from there to the not so high floor in the entrance. This was the way to the main southern part of the building which was erected over the space of the earlier building filled with artificial mound. This part underwent several reconstructions during the capital period in which a narrow longitudinal corridor situated in the center and nine side rooms were formed.
The next big reconstruction of the complex was in the post- capital period during the 12th century and affected the Small palace where the corridor in its longitudinal axis is preserved. The character and designation of the complex are changed. The free squares and yards are overbuilt. The residential and manufacture parts of the quarter are formed. The necropolis is being developed. The blaze of the old capital steps aside to the everyday city medieval life.