The variance of R1a1 in the Balkans might have been enhanced by infiltrations of Indo-European speaking peoples between 2000 and 1000 BC, and by the Slavic migrations to the region in the early Middle Ages.
Varian R1a1 di Balkan mungkin telah diperkuat oleh infiltrasi orang-orang berbahasa Indo-Eropa antara 2000 hingga 1000 SM, dan oleh migrasi Slavia ke wilayah ini pada awal Abad Pertengahan.