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Proto-Slavic, the ancestor language of all Slavic languages, branched off at some uncertain time in a disputed location from common Proto-Indo-European, passing through a Balto-Slavic stage in which it developed numerous lexical and morphophonological isoglosses with Baltic languages. In the framework of the k*rgan hypothesis, "the Indo-Europeans who remained after the migrations became speakers of Balto-Slavic".^[13]

Proto-Slavic proper, or more commonly referred to as Common Slavic or Late Proto-Slavic, defined as the last stage of the language preceding the geographical split of the historical Slavic languages, was likely spoken during the 6th and 7th centuries on a vast territory from Novgorod to southern Greece. That language was unusually uniform, and on the basis of borrowings from foreign languages and Slavic borrowings into other languages, can't be said to have any recognizable dialects. Slavic linguistic unity lasted for at least 1-2 centuries more, as can been seen in Old Church Slavonic manuscripts which, though based on local Slavic speech of Thessaloniki in Macedonia, could still serve the purpose of the first common Slavic literary language.

Многу јасно и гласно пишува од каде е Славјанскиот јазик и КУбрат очигледно со тоа нема никаква врска