Archont Petar and Petar Gojniković are two different people. Archont Petar was born in ca. 930. Petar Gojniković was born much earlier. Read this line from the House of Vlastimirović article: "Knez Petar Gojniković (son of Gojnik, grandson of Vlastimir), born ca. 870, ruled 892/3-917/8, captured by Bulgarians, died in captivity. " Those dates are nowhere close to of Archont Petar's. All I know for a fact is that Archont Petar died either during or after the 970s. So, please, don't put false facts in an article unless you do some research. Also, Archont Petar is also called Predimir and in some sources, I am finding the use of Predimir rather than Petar for Archont Petar. This should help.