Haplogroup R-L21 | |
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![]() Distribution of major subclade R-DF13 across western Europe | |
Possible time of origin | 2,600 BC |
Possible place of origin | South-west Britain |
Ancestor | R1b (R-M343) * R-M269 ** R-L151 *** R-P312 **** R-Z290 |
Descendants | R-A5846 R-S552 * R-DF63 * R-DF13 |
Highest frequencies | Irish Scottish Welsh Bretons English |
R-L21 or R1b1a2a1a2c, also known as R-M529 or R-S145, is a Human Y-chromosome DNA haplogroup. It is often linked to the Insular Celts. [1] One subclade, R-DF13 comprises over 99% of bearers. It is dominant among males in Ireland, Scotland, Wales and Brittany, present in high frequencies in England and western France and present also to a lesser extent in Iberia, Scandinavia and the Low Countries. [2]
This haplogroup first emerges in the Early Bronze Age in Britain and Ireland, where the earliest samples begin to appear. Its introduction was part of a large genetic transformation associated with the Bell Beaker culture, wherein steppe descended peoples largely replaced Britain's earlier Neolithic population. The lineage reached a frequency of 90% in early Bronze Age Britain (being nearly absent in contemporary samples from the continent), it gradually declined through the Middle Bronze Age to 70% by the Iron Age (due to continental migrations which also increased the levels of EEF admixture among Britons). [note 1] It later fell to its modern levels in Britain after the Anglo-Saxon invasions. However, it still remains the dominant lineage in Ireland, Scotland, Brittany and Wales. Its origin is possibly around south west Britain as Cornwall is where the highest persistence of R-DF63 descended subclades are found, being the elder sibling of the extremely dominant R-DF13 subclade. [note 2]
Below are listed some theorized lineages of prominent families.
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The Amesbury Archer is an early Bronze Age man whose grave was discovered during excavations at the site of a new housing development in Amesbury near Stonehenge. The grave was uncovered in May 2002. The man was middle aged when he died, estimated between 35 and 45, and is believed to date from about 2300 BC. He is nicknamed "the Archer" because of the many arrowheads buried with him. The grave contained more artefacts than any other early British Bronze Age burial, including the earliest known gold objects ever found in England. It was the first evidence of a very high status and wealth expressed in a burial from that time. Previously, Bronze Age society had been assumed not to have been particularly hierarchical.
Haplogroup I (M170) is a Y-chromosome DNA haplogroup. It is a subgroup of haplogroup IJ, which itself is a derivative of the haplogroup IJK. Subclades I1 and I2 can be found in most present-day European populations, with peaks in some Northern European and Southeastern European countries.
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In human genetics, Haplogroup R-DF27 (R1b1a2a1a2a) is a Y-chromosome haplogroup which is a subdivision of haplogroup R-M269 defined by the presence of the marker DF27. Along with R-U152 and R-L21, the lineage is to a significant extent associated with Proto-Celtic, Celtic and later Celtiberian movements.
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