Haplogroup R1b-L21
R1b-L21 or R1b-M529 is a Human Y-chromosome DNA haplogroup, characteristic of the inhabitants of Great Britain and Ireland.Origin
R1b-L21 is likely a haplogroup belonging to the Insular Celts, who migrated to Western Europe during the Bronze Age, populating vast regions of what is now Ireland, Great Britain, Northern Spain and northern France. The marker is also found to a lesser extent in the remainder of France, western Switzerland, the Low Countries, northwestern Germany, Denmark, and the northwestern Iberian peninsula.
Currently this haplogroup is mostly found among the inhabitants of Ireland and Great Britain, but is also found in Brittany, northern France, modern Northern Portugal, Galicia and Asturias of the northwest Spain, and has some presence in Belgium and the Netherlands.
Three Early Bronze Age men from burials on Rathlin Island off the north coast of Ireland were all R1b1a2a1a2c, or R1b-L21. Rathlin2 was further defined as R1b1a2a1a2c1, or R1b-DF13/S521/CTS241. Rathlin1 was further defined as R1b1a2a1a2c1g, or R1b-DF21/S192.
