This article presents burial rites of State of Lithuania in the 13th and 14th centuries, reveals its features and searches for the interaction between the burial rites and the development of the society. Burial rites are analyzed in a broad context of processes: the spreading of the cremation, the reformation of the religion, the unification of the material culture, the disappearance of regional differences and the establishment of the Lithuanian nation. Furthermore, the data of anthropology and genetics is examined. In the article, the burial rites of the 13th and 14th centuries are seen as an integral part of the evolution of State of Lithuania.