Overall, far less is known about the layout and contents of Pliska prior to the conversion to Christianity than afterwards. No stone buildings have been dated with certainty from before the Bulgars converted to Christianity in 864/5, and many wooden buildings (which were initially presumed to have come from the pagan era) also appear to have been built later on. It's not clear which buildings were built in the decades immediately after 681. When the earthen rampart was built, Pliska had a very low population. Dimitrov's map based on the 1989 to 1991 dredging works in the Outer Town suggests that there were no more than six to twelve hamlet sized settlements there, while there might have been thirty or so by the tenth century.