The paper presents the syncretisms of autochthonous and Roman cults on the eastern Adriatic coast. Only the connection of local with Roman cults led to the survival of local religious traditions. In some areas, the connection process was easier, for example the Istrian peninsula, while it is a little slower in Liburns, Delmata and Japods. Romanization in Istria took place more quickly due to the proximity of the Apennine peninsula. But that is not the only reason. The Italian settlers make quite a number of votaries syncretized deities. This was their way of infiltrating the Histrian society. In contrast to Histrians, the situation is slightly different in the Roman province of Dalmatia. Initially, one notices that there are far fewer syncretized deities. Then, according to the analyzes of the places where the monuments were found, it is established that the united deities were worshiped more on the coast than inland. It is considered that it was easier for the development of Roman culture on the coast than in the hinterland of the province. Because tribal communities lived in the hinterland, which did not surrender to Roman culture easily. Nevertheless, the epigraphic monuments in this case testify that history is not written only by the victors.