▁r amp art . ▁ ▁Over all , ▁far ▁less ▁is ▁known ▁about ▁the ▁layout ▁and ▁contents ▁of ▁Pl iska ▁prior ▁to ▁the ▁conversion ▁to ▁Christian ity ▁than ▁afterwards . ▁No ▁stone ▁buildings ▁have ▁been ▁dated ▁with ▁certain ty ▁from ▁before ▁the ▁Bulg ars ▁converted ▁to ▁Christian ity ▁in ▁ 8 6 4 / 5 , ▁and ▁many ▁wooden ▁buildings ▁( which ▁were ▁initially ▁pres umed ▁to ▁have ▁come ▁from ▁the ▁pag an ▁era ) ▁also ▁appear ▁to ▁have ▁been ▁built ▁later ▁on . ▁ ▁It ' s ▁not ▁clear ▁which ▁buildings ▁were ▁built ▁in ▁the ▁dec ades ▁immediately ▁after ▁ 6 8 1 . ▁When ▁the ▁ear then ▁r amp art ▁was ▁built , ▁Pl iska ▁had ▁a ▁very ▁low ▁population . ▁Dim it rov ' s ▁map ▁based ▁on ▁the ▁ 1 9 8 9 ▁to ▁ 1 9 9 1 ▁d red ging ▁works ▁in ▁the ▁Out er ▁Town ▁suggests ▁that ▁there ▁were ▁no ▁more ▁than ▁six ▁to ▁twelve ▁ham let ▁s ized ▁settlement s ▁there , ▁while ▁there ▁might ▁have ▁been ▁thirty ▁or ▁so ▁by ▁the ▁t enth ▁century . ▁ ▁There ▁is ▁however ▁still ▁no ▁pla us ible ▁explanation ▁for ▁why ▁the ▁ear then ▁r amp art ▁and ▁d itch ▁built ▁around ▁Pl iska ▁enc irc led ▁such ▁a ▁large ▁area . ▁A ▁few ▁areas ▁appear ▁to ▁have ▁been ▁inhab ited ▁by ▁people ▁who ▁provided ▁services ▁or ▁took ▁part ▁in ▁craft ▁production ▁for ▁the ▁palace ▁centre , ▁and ▁agricult ure ▁clearly ▁took ▁place ▁within ▁the ▁ear then ▁r