Haplogroup I1

Y-DNA (paternal line) · one of the I lineages

A Germanic/Scandinavian lineage; its arrival in Britain marks the early-medieval “Anglo-Saxon” migration. [isogg][gretzinger2022][aadr][yfull]

The Anglo-Saxon signal

Estimated age of the lineage: ~4,600 years (TMRCA). Explore the full deep subtree (I-DF29) at YFull → — the live, SNP-level tree where you can drill down to your own terminal subclade. [yfull]

In the ancient British record

Frequency of I1 among ancient male samples from Britain & Ireland, by period — from our aggregation of the CC0 Allen Ancient DNA Resource. See the full chart.

Early Medieval 23%
Medieval+ 4%

For a fuller account, search “Haplogroup I1” in a reference such as Wikipedia or ISOGG.

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
[gretzinger2022] Gretzinger et al., “The Anglo-Saxon migration and the formation of the early English gene pool”, Nature 610 (2022), doi:10.1038/s41586-022-05247-2. CC BY — cite; open data · link
[aadr] Allen Ancient DNA Resource (AADR) v66, Mallick & Reich (Harvard), doi:10.7910/DVN/FFIDCW. CC0 1.0 (public domain dedication) · link
[yfull] YFull YTree (github.com/YFullTeam/YTree) — a phylogenetic Y-chromosome tree with age estimates. CC BY 4.0 (attribution required) · link