You re right Pax He was from the 9th century not the 10th If he existed in the 10th century he d have probably seen Knez Vladimir Dukljanski Jovan Vladimir Besides I found out that on the Geneaology of the rulers of Montenegro at montenegrina net Archont Petar is listed to have ruled during the 9th century opening up a possibility that Archont Petar is indeed Petar Gojnikovi