Few monuments and random findings, dated the 6_th and from the 10_th to the beginning of the 11_th century, left by the natives of the Northern Europe are known in the north-west Priladozhje. Owing to a tense military situation in the 12_th – 14_th centuries, fortified stone walls and ramparts were constructed around the settlements (sites of ancient settlements) to protect the local ancient Karelian population. As a result of archeological research, substantial data on the material culture, household complexity of the ancient Karelians, and localization of certain types of farming depending on the environmental conditions, were received. Archeological data were significantly enlarged by the material from the west_european written sources, Old Russian chronicles and papers, and birchbark manuscripts, which must be an evidence of an active foreign policy of the medieval Karelian population.