 Concerning the late Roman period of (not only) Germanic ""Völkerwanderung"", some suggestions have been made, at least for Britain, with Y haplogroup I1a being associated with Anglo-Saxon immigration in eastern England, and R1a being associated with Norse immigration in northern Scotland.There are four main Y-chromosome DNA haplogroups that account for most of Europe's patrilineal descent.Putting aside small enclaves, there are also several haplogroups apart from the above four that are less prominent or most common only in certain areas of Europe.