In the 10th century several chain buildings form the square in the northern part of the Inner town. The square used to play an important part in the capital’s entire town structure. The phiale takes the central place in the square- it means a shallow cup in Greek. A unique water installation called phiale is constructed 23 m. away from the gate’s eastern half. Its structure shows the high achievements of the proto- Bulgarian architecture, aesthetics and town structure concept. The phiale is a round decorative swimming pool from outside. The swimming pool’s inner part is a regular eight- axis with length of the separate sides 1,10 m. This form was achieved by coating with red bricks placed in ten horizontal rows and the joints are coated with water- proof red plaster. The building is made of big limestone blocks placed in horizontal rows on the inner side. Slightly trapezium- shaped they form the outer round profile of the phiale with a diameter of 5,80 m. put one next to another and plastered with white plaster. The swimming pool’s surface is coated with polished marble plates on the top of which there was a colonnade of marble posts bearing the semispherical ciborium roof. The water supply was organized by separate canals made of clay and lead pipes. A sewage canal  is placed on the southern wall which starts with a ceramic tube with a diameter of 0,12 cm. There is another canal in the construction’s upper end with clay pipes in the beginning and lead ones in the inner part.

There was a small cross vaulted church with an inscribed cross, three apses and a narthex right on the west during the same period. Its length is 13 m. and its width- 7 m. The first graves of the Christian necropolis used to be scattered around the church in the 11th century which was very often used in the 12th- 13th century. The southern way of the Preslav’s aul extension was found in less than a meter north of the church.