Excavations in the valley of Krapinets river, Buvem Kassaba locality uncovered a medieval estate from the 9th-10th century AD. The estate included an aristocratic dwelling, a small Christian chapel, workshops and other economic buildings. The site was abandoned in the 10th century.
The medieval apocryphal literature mentions 'The area of a hundred mounds' - referring to the numerous mounds in Sboryanovo. The aristocratic estate in Buvem Kassaba, one other medieval settlement near Ginina Mound, and one mound with broken 9th century ceramics confirm the significance of the region during the First Bulgarian Empire.
A 10th century statuette found in Sboryanovo suggests that Bulgars shared a variety of religious beliefs in the early medieval period.