Haplogroup I

mtDNA (maternal line)

A West-Eurasian maternal lineage. [isogg]

In the ancient British record

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

Bronze Age 4%
Early Medieval 5%
Iron Age 2%

Fuller account: I 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