West Slavs
Łowmiański developed a theory that the cult of the Proto-Indo-European god "*Dyḗus" developed among the Slavs in two forms: in the form of Svarog among the West Slavs, and in the form of Perun among the Easte Slavs. Subsequently, the cult of Svarog was to be transported in the 6th century by Serbs and Croats from West Slavs to the Balkans.