The article deals with the perception of the tribe Papiria in the nomenclature of the Roman civics in two Trajanic colonies in Moesia Superior and Moesia Inferior-col(onia) Ulp(ia) Tra(iana) Rat(iariensium) and col(onia) Ulp(ia) Oescensium respectively. Although located close geographically and with a few common traits of their historical development, some discrepancies appeared in the topic which are discussed. The inscriptions provide, although scanty, some information on the tribe affiliation of the civic and religious colonial elite, augustales coloniae as well as the tribe affiliation as a part of a certain ornamenta. All this allows to establish the Roman tribe as an important social marker and for prestige in the Roman civic community, and can therefore serve in the Roman provinces as a sign of the progress of urbanization and Romanization. Certainly, the observations made are preliminary due to the scanty evidence available so far for various reasons.