The Steppe theory was first formulated by Otto Schrader (1883) and V. Gordon Childe (1926), then systematized in the 1950s by Marija Gimbutas, who used the term to group various prehistoric cultures, including the Yamnaya (or Pit Grave) culture and its predecessors. In the 2000s, David Anthony instead used the core Yamnaya culture and its relationship with other cultures as a point of reference.
Scheme of Indo-European language dispersals from c. 4000 to 1000 BC according to the widely held Kurgan hypothesis. – Center: Steppe cultures 1 (black): Anatolian languages (archaic PIE) 2 (black): Afanasievo culture (early PIE) 3 (black) Yamnaya culture expansion (Pontic-Caspian steppe, Danube Valley) (late PIE) 4A (black): Western Corded Ware 4B-C (blue & dark blue): Bell Beaker; adopted by Indo-European speakers 5A-B (red): Eastern Corded ware 5C (red): Sintashta (proto-Indo-Iranian) 6 (magenta): Andronovo 7A (purple): Indo-Aryans (Mittani) 7B (purple): Indo-Aryans (India) [NN] (dark yellow): proto-Balto-Slavic 8 (grey): Greek 9 (yellow):Iranians – [not drawn]: Armenian, expanding from western steppe
Three genetic studies in 2015 gave partial support to the Steppe theory regarding the Indo-European Urheimat. According to those studies, haplogroups R1b and R1a, now the most common in Europe (R1a is also common in South Asia) would have expanded from the steppes north of the Pontic and Caspian seas, along with at least some of the Indo-European languages; they also detected an autosomal component present in modern Europeans which was not present in Neolithic Europeans, which would have been introduced with paternal lineages R1b and R1a, as well as Indo-European languages.
Arguments for the identification of the Proto-Indo-Europeans as steppe nomads from the Pontic–Caspian region had already been made in the 19th century by the German scholars, Theodor Benfey (1869) and Victor Hehn [de] (1870), followed notably by Otto Schrader (1883, 1890).Theodor Poesche had proposed the nearby Pinsk Marshes. In his standard work about PIE and to a greater extent in a later abbreviated version,Karl Brugmann took the view that the urheimat could not be identified exactly at that time, but he tended toward Schrader's view. However, after Karl Penka's 1883 rejection of non-European origins, most scholars favoured a Northern European origin (see North European hypothesis).
The view of a Pontic origin was still strongly favoured, e.g., by the archaeologists V. Gordon Childe and Ernst Wahle. One of Wahle's students was Jonas Puzinas, who in turn was one of Gimbutas's teachers. Gimbutas, who acknowledges Schrader as a precursor, was able to marshal a wealth of archaeological evidence from the territory of the Soviet Union (and other countries then belonging to the eastern bloc) not readily available to scholars from western countries, enabling her to achieve a fuller picture of prehistoric Europe.
When it was first proposed in 1956, in The Prehistory of Eastern Europe, Part 1, Marija Gimbutas's contribution to the search for Indo-European origins was an interdisciplinary synthesis of archaeology and linguistics. The Kurgan model of Indo-European origins identifies the Pontic–Caspian steppe as the Proto-Indo-European (PIE) urheimat, and a variety of late PIE dialects are assumed to have been spoken across the region. According to this model, the Kurgan culture gradually expanded until it encompassed the entire Pontic–Caspian steppe, Kurgan IV being identified with the Yamnaya culture of around 3000 BC.
The mobility of the Kurgan culture facilitated its expansion over the entire region, and is attributed to the domestication of the horse and later the use of early chariots. The first strong archaeological evidence for the domestication of the horse comes from the Sredny Stog culture north of the Azov Sea in Ukraine, and would correspond to an early PIE or pre-PIE nucleus of the 5th millennium BC. Subsequent expansion beyond the steppes led to hybrid, or in Gimbutas's terms "kurganized" cultures, such as the Globular Amphora culture to the west. From these kurganized cultures came the immigration of Proto-Greeks to the Balkans and the nomadic Indo-Iranian cultures to the east around 2500 BC.
Gimbutas defined and introduced the term "Kurgan culture" in 1956 with the intention of introducing a "broader term" that would combine Sredny Stog II, Pit Grave, and Corded ware horizons (spanning the 4th to 3rd millennia in much of Eastern and Northern Europe). The model of a "Kurgan culture" brings together the various cultures of the Copper Age to Early Bronze Age (5th to 3rd millennia BC) Pontic–Caspian steppe to justify their identification as a single archaeological culture or cultural horizon, based on similarities among them. The eponymous construction of kurgans (mound graves) is only one among several factors. As always in the grouping of archaeological cultures, the dividing line between one culture and the next cannot be drawn with hard precision and will be open to debate.
Cultures that Gimbutas considered as part of the "Kurgan culture":
Wave 2, mid 4th millennium BC, originating in the Maykop culture and resulting in advances of "kurganized" hybrid cultures into northern Europe around 3000 BC (Globular Amphora culture, Baden culture, and ultimately Corded Ware culture). According to Gimbutas this corresponds to the first intrusion of Indo-European languages into western and northern Europe.
Wave 3, 3000–2800 BC, expansion of the Pit Grave culture beyond the steppes, with the appearance of the characteristic pit graves as far as the areas of modern Romania, Bulgaria, eastern Hungary and Georgia, coincident with the end of the Cucuteni–Trypillia culture and Trialeti culture in Georgia (c. 2750 BC).
3500–3000: Middle PIE. The Pit Grave culture is at its peak, representing the classical reconstructed Proto-Indo-European society with stone idols, predominantly practicing animal husbandry in permanent settlements protected by hillforts, subsisting on agriculture, and fishing along rivers. Contact of the Pit Grave culture with late Neolithic Europe cultures results in the "kurganized" Globular Amphora and Baden cultures (Wave 2). The Maykop culture shows the earliest evidence of the beginning Bronze Age, and Bronze weapons and artifacts are introduced to Pit Grave territory. Probable early Satemization.
3000–2500: Late PIE. The Pit Grave culture extends over the entire Pontic steppe (Wave 3). The Corded Ware culture extends from the Rhine to the Volga, corresponding to the latest phase of Indo-European unity, the vast "kurganized" area disintegrating into various independent languages and cultures, still in loose contact enabling the spread of technology and early loans between the groups, except for the Anatolian and Tocharian branches, which are already isolated from these processes. The centum–satem break is probably complete, but the phonetic trends of Satemization remain active.
The Kurgan hypothesis describes the initial spread of Proto-Indo-European during the 5th and 4th millennia BC. As used by Gimbutas, the term "kurganized" implied that the culture could have been spread by no more than small bands who imposed themselves on local people as an elite. This idea of the PIE language and its daughter-languages diffusing east and west without mass movement proved popular with archaeologists in the 1970s (the pots-not-people paradigm). The question of further Indo-Europeanization of Central and Western Europe, Central Asia and Northern India during the Bronze Age is beyond its scope, far more uncertain than the events of the Copper Age, and subject to some controversy. The rapidly developing field of archaeogenetics and genetic genealogy since the late 1990s has not only confirmed a migratory pattern out of the Pontic Steppe at the relevant time, it also suggests the possibility that the population movement involved was more substantial than anticipated and invasive.
Invasion versus diffusion scenarios (1980s onward)
Gimbutas believed that the expansions of the Kurgan culture were a series of essentially hostile military incursions where a new warrior culture imposed itself on the peaceful, matrilinear, and matrifocal (but not matriarchal) cultures of "Old Europe", replacing it with a patriarchalwarrior society, a process visible in the appearance of fortified settlements and hillforts and the graves of warrior-chieftains:
The process of Indo-Europeanization was a cultural, not a physical, transformation. It must be understood as a military victory in terms of successfully imposing a new administrative system, language, and religion upon the indigenous groups.
In her later life, Gimbutas increasingly emphasized the authoritarian nature of this transition from the egalitarian process of the nature/earth mother goddess (Gaia) to a patriarchal society and the worship of the father/sun/weather god (Zeus, Dyaus).
J. P. Mallory (in 1989) accepted the Kurgan hypothesis as the de facto standard theory of Indo-European origins, but he recognized criticism of any alleged, but not actually stated, "radical" scenario of military invasion; the slow accumulation of influence through coercion or extortion – Gimbutas's actual main scenario – was often taken as general and immediate raiding and then conquest:
One might at first imagine that the economy of argument involved with the Kurgan solution should oblige us to accept it outright. But critics do exist and their objections can be summarized quite simply: Almost all of the arguments for invasion and cultural transformations are far better explained without reference to Kurgan expansions, and most of the evidence so far presented is either totally contradicted by other evidence, or is the result of gross misinterpretation of the cultural history of Eastern, Central, and Northern Europe.
Alberto Piazza and Luigi Luca Cavalli-Sforza have tried in the 2000s to align the Anatolian hypothesis with the steppe theory. According to Alberto Piazza, writing in 2000, "[i]t is clear that, genetically speaking, peoples of the Kurgan steppe descended at least in part from people of the Middle Eastern Neolithic who immigrated there from Anatolia." According to Piazza and Cavalli-Sforza (2006), the Yamna-culture may have been derived from Middle Eastern Neolithic farmers who migrated to the Pontic steppe and developed pastoral nomadism. Wells agrees with Cavalli-Sforza that there is "some genetic evidence for migration from the Middle East." Nevertheless, the Anatolian hypothesis is incompatible with the linguistic evidence.
^Mallory 1989, p. 185. "The Kurgan solution is attractive and has been accepted by many archaeologists and linguists, in part or total. It is the solution one encounters in the Encyclopædia Britannica and the Grand Dictionnaire Encyclopédique Larousse."
^Strazny 2000, p. 163. "The single most popular proposal is the Pontic steppes (see the Kurgan hypothesis)..."
^Renfrew, Colin (1990). Archaeology and Language: The Puzzle of Indo-European Origins. CUP Archive. pp. 37–38. ISBN978-0-521-38675-3.
^ abJones-Bley, Karlene (2008). "Proceedings of the Eighteenth Annual Indo-European Conference, Los Angeles, November 3–4, 2006". Historiographia Linguistica. 35 (3): 465–467. doi:10.1075/hl.35.3.15koe. ISSN0302-5160.
^ abParpola in Blench & Spriggs 1999, p. 181. "The history of the Indo-European words for 'horse' shows that the Proto-Indo-European speakers had long lived in an area where the horse was native and / or domesticated.(Mallory 1989, pp. 161–163). The first strong archaeological evidence for the domestication of the horse comes from the Ukrainian Srednij Stog culture, which flourished c. 4200–3500 BC and is likely to represent an early phase of the Proto-Indo-European culture (Anthony 1986, pp. 295f. harvnb error: no target: CITEREFAnthony1986 (help); Mallory 1989, pp. 162, 197–210). During the Pit Grave culture (c. 3500–2800 BCE), which continued the cultures related to Srednij Stog and probably represents the late phase of the Proto-Indo-European culture – full-scale pastoral technology, including the domesticated horse, wheeled vehicles, stock breeding and limited horticulture, spread all over the Pontic steppes, and, c. 3000 BCE, in practically every direction from this centre (Anthony 1986 harvnb error: no target: CITEREFAnthony1986 (help); Anthony 1991 harvnb error: no target: CITEREFAnthony1991 (help); Mallory 1989, vol. 1).
^Gimbutas 1970, p. 156: "The name Kurgan culture (the Barrow culture) was introduced by the author in 1956 as a broader term to replace and Pit-Grave (Russian Yamnaya), names used by Soviet scholars for the culture in the eastern Ukraine and south Russia, and Corded Ware, Battle-Axe, Ochre-Grave, Single-Grave and other names given to complexes characterized by elements of Kurgan appearance that formed in various parts of Europe"
^Piazza & Cavalli-Sforza 2006, p. [page needed] harvnb error: no target: CITEREFPiazzaCavalli-Sforza2006 (help): "...if the expansions began at 9,500 years ago from Anatolia and at 6,000 years ago from the Yamnaya culture region, then a 3,500-year period elapsed during their migration to the Volga-Don region from Anatolia, probably through the Balkans. There a completely new, mostly pastoral culture developed under the stimulus of an environment unfavorable to standard agriculture, but offering new attractive possibilities. Our hypothesis is, therefore, that Indo-European languages derived from a secondary expansion from the Yamnaya culture region after the Neolithic farmers, possibly coming from Anatolia and settled there, developing pastoral nomadism.
^Wells & Read 2002, p. [page needed]: "... while we see substantial genetic and archaeological evidence for an Indo-European migration originating in the southern Russian steppes, there is little evidence for a similarly massive Indo-European migration from the Middle East to Europe. One possibility is that, as a much earlier migration (8,000 years old, as opposed to 4,000), the genetic signals carried by Indo-European-speaking farmers may simply have dispersed over the years. There is clearly some genetic evidence for migration from the Middle East, as Cavalli-Sforza and his colleagues showed, but the signal is not strong enough for us to trace the distribution of Neolithic languages throughout the entirety of Indo-European-speaking Europe."
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Gimbutas, Marija (Spring–Summer 1985), "Primary and Secondary Homeland of the Indo-Europeans: comments on Gamkrelidze–Ivanov articles", Journal of Indo-European Studies, 13 (1&2): 185–201