Haplogroup X

mtDNA (maternal line)

A scattered maternal lineage found in West Eurasia, North Africa and, distinctively, parts of North America. [isogg]

In the ancient British record

Frequency of X among ancient samples from Britain & Ireland, by period — from our aggregation of the CC0 Allen Ancient DNA Resource. See the full chart.

Bronze Age 2%
Early Medieval 1%
Iron Age 2%
Neolithic 3%

Fuller account: X on Wikipedia.

Remember: a haplogroup is a deep, broad lineage shared by many people — not an ethnicity, a nationality or a clan. See what DNA can and can’t tell you.

Sources

[isogg] International Society of Genetic Genealogy (ISOGG), Y-DNA Haplogroup Tree. Reference — cite for haplogroup nomenclature only (not frequencies) · link