History of the Slavic languages

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The history of the Slavic languages stretches over 3000 years, from the point at which the ancestral Proto-Balto-Slavic language broke up (c. 1500 BC) into the modern-day Slavic languages which are today natively spoken in Eastern, Central and Southeastern Europe as well as parts of North Asia and Central Asia.

The first 2000 years or so consist of the pre-Slavic era: a long, stable period of gradual development during which the language remained unified, with no discernible dialectal differences.

The last stage in which the language remained without internal differences can be dated to around 500 AD and is sometimes termed Proto-Slavic proper or Early Proto-Slavic. Following this is the Common Slavic period (c. 500–1000 AD), during which the first dialectal differences appeared but the entire Slavic-speaking area continued to function as a single language, with sound changes tending to spread throughout the entire area.

By around 1000 AD, the area had broken up into separate East Slavic, West Slavic and South Slavic languages, and in the following centuries, i.e. 11–14th century, it broke up further into the various modern Slavic languages, of which the following are extant: Belarusian, Russian, Rusyn and Ukrainian in the East; Czech, Slovak, Polish, Kashubian and the Sorbian languages in the West, and Bulgarian, Macedonian, Serbo-Croatian and Slovene in the South.

The period from the early centuries AD to the end of the Common Slavic period around 1000 AD was a time of rapid change, concurrent with the explosive growth of the Slavic-speaking era. By the end of this period, most of the features of the modern Slavic languages had been established.

The first historical documentation of the Slavic languages is found in isolated names and words in Greek documents starting in the 6th century AD, when Slavic-speaking tribes first came in contact with the Greek-speaking Byzantine Empire.

The first continuous texts date from the late 9th century AD and were written in Old Church Slavonic—the first Slavic literary language, based on the South Slavic dialects spoken around Thessaloniki in Greek Macedonia—as part of the Christianization of the Slavs by Saints Cyril and Methodius and their followers. Because these texts were written during the Common Slavic period, the language they document is close to the ancestral Proto-Slavic language and is critically important to the linguistic reconstruction of Slavic-language history.

This article covers the development of the Slavic languages from the end of the Common Slavic period (c. 1000 AD) to the present time. See the article on Proto-Slavic for a description of the Proto-Slavic language of the late first millennium AD, and history of Proto-Slavic for the earlier linguistic history of this language.