We will examine how the diversity of historical sources affects the portrayal of the Balkan Slavs by following two writings that notably differ. First is De Administrando Imperio, written in the X century. Our second source is the Chronicle of the Priest of Duklja about which very little is known. The two sources have a strong influence on our understanding of the earliest history of the Slavs that dwell in the Western Balkans. Hence, on our understanding of the modern nations, i.e. Croats and Serbs. These sources are so different when regarding their historicity, time of composition etc. But in terms of myths, we see the same patterns: coming of pagan peoples in Roman Dalmatia, story of their origin, how they were baptised, who were their rulers, what kind of dynasties they had, when did it happen and many more. Following this general ethnogenetic and mythological framework, we will try to conclude the relationship between myth and the identity of a European populace. To achieve this goal, we used qualitative and quantitative content analysis and provided their narrative networks of the mentioned texts. These networks illustrate patterns of connections between different ethnogenetic elements in the writings that serve to form groups identities of interest.