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Y-DNA Haplogroup Atlas

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Haplogroup I1-Y7071

I1-Y7071 Baltic–Nordic

Macro-haplogroup
I
Parent clade
I1
Formed (estimate)
c. 3,500–4,000 years before present
TMRCA (estimate)
c. 2,200–2,700 years ago

Overview

I1-Y7071 is a Baltic–Scandinavian microbranch of I1 that emerged along the southern Baltic shore during the late Nordic Bronze Age. This region hosted dense interaction networks linking Pomerania, Mecklenburg, Öland, Bornholm and southern Sweden. The lineage likely belongs to small but mobile coastal groups involved in early maritime trade and proto-Germanic cultural diffusion.

Geographic distribution

Today, I1-Y7071 is most common in Poland’s Pomeranian region, Lithuania, Latvia, Denmark and southern Sweden. It appears at low levels in Norway, northern Germany and Finland. Its distribution strongly mirrors Baltic maritime corridors.

Ancient DNA

  • Baltic Iron Age individuals near the Vistula delta exhibit Z58 lineages ancestral to Y7071.
  • Some Viking Age coastal burials in Denmark and Sweden fall near basal Y7071 clades.
  • Early Slavic settlements in northern Poland occasionally contain Y7071-related microclades.

Phylogeny & subclades

Y7071 branches under the Z58 > Z138 coastal radiation but is distinct from major expansions like BY158 or Z1409. Y7071, Y7074 and BY15381 define a small but regionally coherent clade.

  • I1-Y7074
  • I1-BY15381
  • Basal Y7071*

Notes & context

I1-Y7071 is a sensitive marker for Baltic–Scandinavian genetic interactions and contributes to understanding the emergence of coastal proto-Germanic groups.