Pliska

Pliska is the name of both the first capital of Danubian Bulgaria and a small village (formerly known as Aboba) which was renamed after the historical Pliska after its site was determined and excavations begun.

Pliska in "Islands in the Sea"
Pliska was the capital of Telerikh's Bulgar Khanate. In AD 769, Telerikh invited two delegations, one Muslim from Constantinople, the other Catholic from Rome, to Pliska in order to attempt to convert him to their respective religions.