However, a disadvantage of this historical nationalism soon became apparent. It suggested there were no strong external borders, while allowing for the fairly clear-cut internal borders that were emerging as the society pillarized into three parts. After 1945 the tribal knowledge lost its grip on anthropology and mostly vanished. Modern variants of the Batavian founding myth are made more accurate by pointing out that the Batavians were one part of the ancestry of the Dutch people - together with the Frisians, Franks and Saxons - by tracing patterns of DNA. Echoes of this cultural continuity can still be found among various areas of Dutch modern culture, such as the very popular replica of the ship "Batavia" that can today be found in Lelystad.