Up to 84% of medieval Albanian ancestry came from Bronze & Iron Age populations of the western Balkans (Illyrians). 80-90% of modern Albanian ancestry can be directly derived from medieval Albanian ancestry.
Across 3,000 years of genetic history, populations from Albania show a tight clustering anchored on a nucleus of BA-IA ancestry formed after the Yamnaya migrations and the formation of western Paleo-Balkan populations.
Samples of medieval Albanians show that they were present both in north and south Albania in the early medieval period, had no Slavic ancestry and derived almost all of their ancestry from Roman West Balkan populations with as high as 84% BA-IA local ancestry.
Modern Albanians, both north and south, derive most of their ancestry from such Roman West Balkan populations with some additional Slavic-mediated or mixed Slavic/Paleo-Balkan ancestry.
Albanians from all regions, from north to south, inherit the same common ancestry from medieval Albanians with whom they share IBD (identity-by-descent) segments across distant regions.
About 80% of Albanian Y-DNA ancestry stems from the pre-Migration Period.
As Albanian I1 clades might be pre-Migration Period too if they descend from Germanic tribes of the Roman Balkans. This could mean that more than 85% is pre-Migration Period.
