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Petrus I wæs Serba Cyning fram  1903 oþ  1918 þan be his sige in ðære Fyrstan Woruldguþe wæs his rice mid furþrum underricum gecnytted and þæreft ricsode he swa Serba, Horotiga and Slofena Cyning oþ his deað on  1921.

Forþæm þe Petrus wæs Serba Cyning in þæs rices ielde of herelicum sige wæs he mære on þæm folc swa 'Petrus Cyning se Freogend'.

Petrus Cyning wæs ealdorheretoga ðæs Cynelican Serbiscan Heres in ðæm Illyricum Gewinnum. Forþæm þe he wæs gamel, on  1914 abannede he þe his sunu Alexander Æþeling se wæs his ierfa biþ ricend. In ðære Fyrstan Woruldguþe for se Cyning mid his here in hiera wiðertrode ofer Liubena rice.

Serba Cyningas
Geugoslafa Cyningas