Slavs

• 1. Introduction

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  The Slavs are today estimated to number around 300 million people, spread across Central, Eastern, and Southeastern Europe and into Northern Asia. That figure alone demands a question: how did one grouping of peoples come to populate such a vast arc of the continent? The answer begins not with kingdoms or armies, but with language. Slavic people are defined by their shared Slavic tongue, a family of languages that trace back to a single ancestor called Proto-Slavic, itself a descendant of the ancient Proto-Indo-European root. The word the Slavs used for themselves, reconstructed in Proto-Slavic as Slovene, most likely meant "people who speak the same language". The contrast they drew was sharp. Their word for Germanic peoples meant, roughly, the mute or mumbling ones. A name rooted in mutual comprehension. A people defined, from the very beginning, by who they could understand. What follows is the story of how that linguistic kinship became an identity, an empire, a target, and, finally, a modern world.

• 2. A Name from the Sixth Century

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  Procopius of Caesarea, writing in Byzantine Greek in the 6th century AD, used forms like Sklaboi and Sklabēnoi to describe a people pressing at the empire's borders. His contemporary Jordanes, writing in Latin, called them Sclaveni. These are the oldest surviving uses of the Slavic ethnonym in external sources. The oldest self-recorded form comes later: documents written in Old Church Slavonic from the 9th century use the autonym Slověne. Scholars trace this word to slovo, meaning "word", placing the name's deepest root in the Proto-Indo-European concept of being spoken of or having glory. The related words slava, meaning glory or fame, and sluh, meaning hearing, share that same root. It is cognate with Ancient Greek kleos, as found in the name Pericles, and with the Latin verb meaning "to be called". In the very structure of their own name, the Slavs preserved a philosophical stance: they were the people whose words carried meaning, as opposed to those whose speech was unintelligible noise. In medieval and early modern Latin documents, the shortened forms Sclavi or Sclaveni became standard, appearing in diplomatic records and chronicles across Europe.

• 3. Migration and Expansion

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  Ancient Roman sources from the 1st and 2nd centuries AD placed a people called the Veneti in central Europe, east of the Germanic Suebi and west of the Iranian Sarmatians, between the upper Vistula and Dnieper rivers. Jordanes, in his work Getica written in 551 AD, described the Veneti as a "populous nation" whose dwellings began at the sources of the Vistula and occupied "a great expanse of land". He identified them as ancestors of both the Antes and the Slaveni. By the early 6th century, Byzantine sources recorded these tribes emerging from around the Carpathian Mountains, the lower Danube, and the Black Sea. Procopius wrote in 545 that the Sclaveni and the Antae "actually had a single name in the remote past; for they were both called Sporoi in olden times", a name derived from the Greek word for "to sow". He described them as tall, robust, slightly ruddy in color, and living in scattered housing, constantly moving their settlements. Their military style relied on foot soldiers armed with shields, spears, and bows; heavy armour was reserved for chiefs and their inner circle. The great migration came when westward movement by Germanic tribes in the 5th and 6th centuries opened up territory. Slavs filled the vacuum, moving westward toward the Oder-Elbe line, southward into Bohemia and the Balkans, and northward along the upper Dnieper. Byzantine records described Slav numbers as so immense that grass would not regrow where they had marched. Pope Gregory I, writing in 600 AD to the bishop of Salona in Dalmatia, expressed distress that Slavs had already begun arriving in Italy through Istria.

• 4. First States

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  Daurentius, a Slavic leader whose name survives in the writings of Menander Protector, killed an envoy sent by the Avar khagan Bayan I to demand submission. His reported reply has crossed the centuries: "Others do not conquer our land, we conquer theirs; so it shall always be for us as long as there are wars and weapons." The defiance captured something about early Slavic political life. In the 7th century, a Frankish merchant named Samo backed the Slavs against their Avar rulers and became ruler of the first known Slavic state in Central Europe, called Samo's Empire. It probably did not outlive him, but it set a pattern. Carantania followed, then the Principality of Nitra, and the Moravian principality. The First Bulgarian Empire was founded in 681 as an alliance between the ruling Bulgars and the Slavs of the region; Old Church Slavonic became the empire's official language in 864 AD. Bulgaria spread Slavic literacy and Christianity to the rest of the Slavic world. The Duchy of Croatia was founded in the 7th century, the Principality of Serbia in the 8th, and both the Duchy of Bohemia and the Kievan Rus' in the 9th. By the 12th century, Slavs formed the core population of a cluster of Christian medieval states stretching from the Baltic to the Adriatic and deep into Eastern Europe.

• 5. Three Branches, Many Peoples

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  West Slavs trace their origins to early Slavic tribes who settled Central Europe after Germanic tribes had departed during the migration period. They mixed with Germans, Hungarians, Celts particularly the Boii, Old Prussians, and the Pannonian Avars, and came under the influence of the Catholic Church and the Western Roman Empire. Today the West Slavs include Czechs, Poles, Slovaks, Sorbs, Moravians, Silesians, and Kashubians. East Slavs have origins in early Slavic tribes who mixed with Finns, Balts, Iranians, and later received influence from the Khazars and Vikings. Scandinavians called Varangians and Finnic peoples were involved in the early formation of the Rus' state but were completely absorbed by Slavic culture within a century. The East Slavs trace their national origins to the tribal unions of the Kievan Rus' and Rus' Khaganate, beginning in the 10th century, and came under the influence of Byzantium and the Eastern Orthodox Church. South Slavs mixed with the widest range of peoples: local Proto-Balkanic tribes including Illyrian, Dacian, Thracian, and Hellenic groups, Celtic tribes like the Scordisci, Romans, and invading eastern groups like Gepids, Huns, Avars, Goths, and Bulgars. The Bulgars were themselves gradually absorbed into what became the South Slavic Bulgarian people. In Greece, the dynamic reversed; Slavs were Hellenized rather than assimilating the Greeks, because the Greek-speaking population was more numerous. In Eastern Germany, around 20% of men have historic Slavic paternal ancestry according to Y-DNA testing, and around 20% of foreign surnames in Germany are of Slavic origin.

• 6. Faith and Alphabet

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  Christianization of Slavic populations unfolded between the 7th and 12th centuries. The division that emerged from that process still organizes Slavic religious life today. Orthodox Christianity became predominant among East and South Slavs, while Catholicism took hold among West Slavs and some western South Slavs. The boundary between those two faiths tracks closely along the East-West Schism that began in the 11th century. Islam arrived in the Balkans starting in the 7th century during the early Muslim conquests and was gradually adopted by several Slavic ethnic groups across later centuries. The Bosniaks, Pomaks, Gorani, and Torbeši are among the Muslim Slavic peoples today. The alphabet a Slavic group uses reflects this religious history almost exactly. Orthodox Christians use the Cyrillic alphabet; Catholics use the Latin alphabet. The Bosniaks, who are Muslim, use the Latin alphabet, though Cyrillic is also used in Serbia. Serbian and Montenegrin are written in both scripts. Belarusian has a Latin-script form called Lacinka, and Ukrainian has one called Latynka. Russian is the most widely spoken Slavic language and holds the distinction of being the most spoken native language in all of Europe. In total, thirteen standardized Slavic languages hold official status in at least one country.

• 7. Genocide and Survival

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  In early 1941, Germany began planning Generalplan Ost, a scheme for the genocide of Slavic peoples in Eastern Europe, to be carried out gradually over 25-30 years. The plan called for the starvation of approximately 30 million Slavs and the depopulation of their major cities, after which Eastern Europe would be resettled by ethnic Germans. Nazi ideology classified both Jewish and Slavic peoples as what German sources termed Untermensch, meaning racial subhumans, describing them as a "vast racially subhuman surplus population" intended for elimination. When Germany launched Operation Barbarossa against the Soviet Union in June 1941, Hitler deprioritized the full implementation of Generalplan Ost to focus on the extermination of Jewish people, but elements of it were still carried out. Among those killed were 3.3 million Soviet prisoners of war. Heinrich Himmler ordered his subordinate Ludolf-Hermann von Alvensleben to begin resettling Crimea with ethnic Germans, and hundreds of ethnic Germans were forcibly moved there. The Soviet Red Army recaptured those lands in 1944. Stephen J. Lee estimated that by the end of World War II in 1945, the Russian population was about 90 million fewer than it might otherwise have been. Beyond the German campaign, the ultra-nationalist Ustase committed genocide against Serbs during the war, and Serbian Chetniks committed genocide against Croats and Bosniaks. Fascist Italy sent tens of thousands of Slavs to concentration camps in mainland Italy, Libya, and the Balkans. Two major famines in Russia and the Soviet Union, in 1921-1922 and 1932-1933, caused millions of deaths around the Volga region, Ukraine, and the Northern Caucasus, the second resulting from Stalin's forced collectivization of agriculture in Ukraine.

• 8. Genetics and Origins

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  A 2006 Y-DNA study suggested that the Slavic expansion started from the territory of present-day Ukraine, placing the earliest known Slavic homeland in the basin of the middle Dnieper. A 2025 archaeogenetic study published in Nature, drawing on 555 samples of which 359 came from the Slavic period, found evidence of large-scale population movement from Eastern Europe during the 6th-8th centuries that replaced more than 80% of the local gene pool in Eastern Germany, Poland, and Croatia. A parallel Genome Biology study on South Moravia found a strong genetic shift between the 5th and 7th centuries, inconsistent with local population continuity. The 2025 Nature study identified the best spatial proxy for the Slavic Urheimat, meaning the ancestral homeland, as the south of present-day Belarus and the north of Ukraine, consistent with what archaeologists call the Kyiv culture. East and West Slavs are genetically very similar to each other, despite the wide geographic dispersal of Slavic populations. Together they form the basis of the "East European" gene cluster, which also includes non-Slavic Hungarians and Aromanians. Northern Russians are an exception; they fall into a different "Northern European" genetic cluster alongside Balts and Baltic Finnic peoples. A 2017 study found that Ukrainians and Belarusians carry near-equal amounts of two "European components" common in North Europe and the Caucasus respectively, with no evidence of Asian admixture, though samples from Novosibirsk and Old Believers in Siberia showed 5-10% Central Siberian ancestry. The Polabian language, spoken by Slavs in what is now the German state of Lower Saxony, survived until the beginning of the 19th century, a reminder of how recently some branches of Slavic culture were absorbed into neighboring populations.