History and Evolution of Slavic Languages

Proto-Slavic and the Common Slavic Period

Following its separation from Baltic, Proto-Slavic entered a long, stable phase sometimes called the pre-Slavic era, during which no internal dialectal differences had yet appeared. Linguists place the end of this undifferentiated stage at approximately 500 AD. What followed is generally referred to as the Common Slavic period, lasting from around 500 to 1000 AD. During these five centuries, the Slavic-speaking world remained linguistically unified even as its geographic range expanded dramatically. Sound changes that began in one part of the territory tended to spread across the whole area, which is why, by the eighth century, Proto-Slavic is believed to have been spoken in mutually intelligible form across an enormous stretch of Europe, from Thessaloniki in the south to Novgorod in the north. This wide but still coherent linguistic zone would only begin to fracture into separate branches in the centuries that followed.

Old Church Slavonic and the Mission of Cyril and Methodius

The first written Slavic language was created for a specific historical purpose. In 863, Prince Rostislav of Great Moravia, the first Slavic state, invited the brothers Cyril and Methodius to establish a Slavic-language liturgy and writing system, partly as a way to counter the growing religious and political influence of the Frankish-German church. The result was Old Church Slavonic, based on the Slavic dialects spoken around Thessaloniki. After Cyril and Methodius were forced to leave Moravia, their disciples carried the language south into the Bulgarian kingdoms, where it entered a second major phase of development between 893 and 1081 under the rulers Symeon, Peter, and Samuel. Old Church Slavonic subsequently produced regional written variants, known as recensions, in Bohemia, in the Slovene lands, reflected in the Freising fragments of the late tenth century, and in Croatia and Serbia. Around the year 1000, the different Slavic dialects across this territory remained close enough that these regional variants could interact freely with local speech.

The Split into East, West, and South Slavic

The gradual breakup of Common Slavic into three separate branches was driven by specific historical and geographic developments rather than by a single event. The separation of the South Slavic group from the West Slavic group followed the settlement of the Magyars in the Carpathian Basin during the tenth century, which physically divided the two populations, combined with the Germanization of Slavic-speaking areas in Bavaria and Austria. The connection between the South Slavic and East Slavic groups was broken somewhat later, around the eleventh to twelfth centuries, as speakers of Balkan Romanian expanded eastward across the region. From this point forward, the Balkan Slavic languages developed largely within the cultural orbit of the Byzantine Empire, while the West Slavic languages and the northern branch of South Slavic, including the Lekhitic group that produced Polish, developed in closer contact with Western European culture. The East Slavic group, encompassing the ancestors of Russian, Ukrainian, and Belarusian, converged instead around the Old East Slavic language used in Kievan Rus, a linguistic unity that persisted until at least the twelfth century.

The Emergence of National Literary Languages

After the schism between the Eastern and Western Christian churches in 1054 and the onset of the Crusades, Church Slavonic fell out of everyday use across the West Slavic lands and the western Balkan Slavic region, with the exception of a Croatian revival in the thirteenth century. Czech was the first West Slavic language to develop a substantial independent literature, beginning with verses written in the local dialect at the end of the thirteenth century and followed by a body of Old Czech poetry in the fourteenth century. Polish followed a similar path somewhat later. Its earliest literary language was modeled directly on Czech, including the Czech-mediated form of Latin and German loanwords introduced after the Christianization of Poland. This Czech influence in Polish persisted until the sixteenth century, when the Polish Renaissance produced a literature more closely based on everyday speech, later enriched further through contact with Ukrainian and Belarusian.

Similar processes unfolded elsewhere in the same period. Croatian poets working in Dalmatia during the sixteenth century, influenced by the Italian Renaissance, created an original body of Croatian-language poetry. A Slovene translation of the Bible appeared between 1575 and 1584, and Kashubian and Sorbian religious texts were produced in the same era. Bulgarian and Russian followed a different trajectory, remaining tied to Church Slavonic for far longer. Bulgarian texts continued to be written primarily in Bulgarian Church Slavonic until the sixteenth century, and the vernacular Damaskin religious literature that eventually replaced it developed slowly under Ottoman rule. Old Russian literary texts likewise combined Russian Church Slavonic with vernacular language well into the early modern period, with a major linguistic reform in the mid-seventeenth century shifting the standard used by the Russian Orthodox Church toward a form incorporating Ukrainian and Belarusian elements.