Overview
I1-BY15361 is a Scandinavian-based microbranch that likely originated during the transition from the Nordic Bronze Age to the early Iron Age. The clade emerged within populations inhabiting southern Sweden, coastal Norway and the Danish archipelago. These groups maintained strong interregional maritime connections and served as progenitors for later Iron Age cultural developments, including pre-Viking community formations. BY15361 represents a lineage that expanded modestly within localized Scandinavian populations without undergoing the explosive growth seen in major I1a or Z63 branches.
Geographic distribution
Carriers are concentrated in Sweden (particularly Götaland), southern Norway and Denmark. Secondary distributions appear in Iceland, the Faroe Islands and coastal Britain due to Viking Age movements.
Ancient DNA
- Bronze Age and pre-Roman Iron Age remains from Sweden show upstream I1 lineages ancestral to BY15361.
- Viking Age burials from coastal Norway and Sweden cluster near BY15361-derivative positions.
- Some early medieval Scandinavian settlements in Britain include paternal lines close to BY15363.
Phylogeny & subclades
I1-BY15361 forms a microbranch under the larger Z58 radiation but is distinct from Baltic-oriented clades such as Y7071 and from North Sea clades like BY351. The defining mutations BY15361, BY15363 and Y62219 outline a small but stable Scandinavian subclade.
- I1-BY15363
- I1-Y62219
- Basal BY15361*
Notes & context
BY15361 is significant for high-resolution mapping of Scandinavian paternal microstructure, especially in regions influenced by early maritime cultural networks.
References & external links