Lithuania became Christianized between the end of the 14th century and the beginning of the 15th century, but Lithuanian polytheism survived for another two centuries, gradually losing influence and coherence as a religion. The last conceptions of the old religion survived approximately until the beginning of the 19th century. The relics of the old polytheistic religion were already interwoven with songs, tales and other mythic stories. Gradually Lithuanian polytheism customs and songs merged with the Christian tradition. In the beginning of the 20th century Michał Pius Römer noted - "Lithuanian folklore culture having its sources in heathenism is in complete concord with Christianity".