Vlach could be an exonym for the eastern Romance-speaking community in the Balkans that was considered foreigners in medieval time, which resulted from the occupation and colonization of the region during the Roman Empire and besides that term Vlach is later used to describe not only a member of the population but some occupations like guardians soldiers or frontier troop and cattleman as they were jobs required by medieval state in that time. So Vlach term was practically in one period of medieval time under influence of states to describe some population not necessary ethnicity, because workers they could be from different national groups that often mixed between them-self over time and later created their own new identity under such states' influence.