Proto-Indo-Europeans

The Kurgan (or Steppe) hypothesis was first formulated by Otto Schrader (1883) and V. Gordon Childe (1926),[22][23] and was later systematized by Marija Gimbutas from 1956 onwards. The name originates from the kurgans (burial mounds) of the Eurasian steppes. The hypothesis suggests that the Indo-Europeans, a patriarchal, patrilinear, and nomadic culture of the Pontic–Caspian steppe (which is now part northeastern Bulgaria and southeastern Romania, through Moldova, and southern and eastern Ukraine, through the Northern Caucasus of southern Russia, and into the Lower Volga region of western Kazakhstan), expanding into the area through several waves of migration during the 3rd millennium BC, coinciding with the taming of the horse. Leaving archaeological signs of their presence (see Corded Ware culture), they subjugated the supposedly peaceful, egalitarian and matrilinear European neolithic farmers of Gimbutas' Old Europe. A modified form of this theory by J. P. Mallory, dating the migrations earlier (to around 3500 BC) and putting less insistence on their violent or quasi-military nature, remains the most widely accepted view of the Proto-Indo-European expansion.[note 3]

The Armenian hypothesis, based on the glottalic theory, suggests that the Proto-Indo-European language was spoken during the 4th millennium BC in the Armenian Highland. This Indo-Hittite model does not include the Anatolian languages in its scenario. The phonological peculiarities of PIE proposed in the glottalic theory would be best preserved in the Armenian language and the Germanic languages, the former assuming the role of the dialect which remained in situ, implied to be particularly archaic in spite of its late attestation. Proto-Greek would be practically equivalent to Mycenean Greek and would date to the 17th century BC, closely associating Greek migration to Greece with the Indo-Aryan migration to India at about the same time (viz., Indo-European expansion at the transition to the Late Bronze Age, including the possibility of Indo-European Kassites). The Armenian hypothesis argues for the latest possible date of Proto-Indo-European (sans Anatolian), a full millennium later than the mainstream Kurgan hypothesis. In this, it figures as an opposite to the Anatolian hypothesis, in spite of the geographical proximity of the respective Urheimaten suggested, diverging from the time-frame suggested there by a full three millennia.[26][27]

The Anatolian hypothesis, notably advocated by Colin Renfrew from the 1980s onwards, proposes that the Indo-European languages spread peacefully into Europe from Anatolia from around 7000 BC with the advance of farming (wave of advance). The culture of the Indo-Europeans as inferred by linguistic reconstruction raises difficulties for this theory, since early neolithic cultures lacked the horse, the wheel, and metal – terms for all of which are securely reconstructed for Proto-Indo-European. Renfrew dismisses this argument, comparing such reconstructions to a theory that the presence of the word "café" in all modern Romance languages implies that the ancient Romans had cafés too.

Another argument, made by proponents of the steppe Urheimat (such as David Anthony) against Renfrew, points to the fact that ancient Anatolia is known to have been inhabited in the 2nd millennium BC by non-Indo-European-speaking peoples, namely the Hattians (perhaps North Caucasian-speaking), the Chalybes (language unknown), and the Hurrians (Hurro-Urartian).

Following the publication of several studies on ancient DNA in 2015, Colin Renfrew subsequently acknowledged the important role of migrations of populations speaking one or several Indo-European languages from the Pontic–Caspian steppe towards Northwestern Europe, noting that the DNA evidence from ancient skeletons "had completely rejuvenated Maria Gimbutas' kurgan hypothesis."[28][29]

Early Indo-European migrations from the Pontic steppes and across Central Asia

The Kurgan hypothesis or steppe theory is the most widely accepted proposal to identify the Proto-Indo-European homeland from which the Indo-European languages spread out throughout Europe and parts of Asia. It postulates that the people of a Kurgan culture in the Pontic steppe north of the Black Sea were the most likely speakers of the Proto-Indo-European language (PIE). The term is derived from the Russian kurgan (курга́н), meaning tumulus or burial mound.[30]

According to three autosomal DNA studies, haplogroups R1b and R1a, now the most common in Europe (R1a is also very common in South Asia) would have expanded from the Pontic steppes, along with 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.[31][32][33] Studies which analysed ancient human remains in Ireland and Portugal suggest that R1b was introduced in these places along with autosomal DNA from the Pontic steppes.[34][35]

The subclade R1a1a (R-M17 or R-M198) is most commonly associated with Indo-European speakers. Data so far collected indicate that there are two widely separated areas of high frequency, one in Eastern Europe, around Poland, Ukraine, and Russia, and the other in Southern Asia, around the Indo-Gangetic Plain, which is part of India, Pakistan, Bangladesh, and Nepal. The historical and prehistoric possible reasons for this are the subject of on-going discussion and attention amongst population geneticists and genetic genealogists, and are considered to be of potential interest to linguists and archaeologists also.

A large, 2014 study by Underhill et al., using 16,244 individuals from over 126 populations from across Eurasia, concluded there was compelling evidence, that R1a-M420 originated in the vicinity of Iran.[36] The mutations that characterize haplogroup R1a occurred ~10,000 years BP. Its defining mutation (M17) occurred about 10,000 to 14,000 years ago.[36] Pamjav et al. (2012) believe that R1a originated and initially diversified either within the Eurasian Steppes or the Middle East and Caucasus region.[37]

Ornella Semino et al. propose a postglacial (Holocene) spread of the R1a1 haplogroup from north of the Black Sea during the time of the Late Glacial Maximum, which was subsequently magnified by the expansion of the Kurgan culture into Europe and eastward.[38]

According to Jones et al. (2015) and Haak et al. (2015), autosomal tests indicate that the Yamnaya-people were the result of admixture between "Eastern Hunter-Gatherers" from eastern Europe (EHG) and "Caucasus hunter-gatherers" (CHG).[39][web 1] Each of those two populations contributed about half the Yamnaya DNA.[33][web 1] According to co-author Dr. Andrea Manica of the University of Cambridge:

The question of where the Yamnaya come from has been something of a mystery up to now [...] we can now answer that, as we've found that their genetic make-up is a mix of Eastern European hunter-gatherers and a population from this pocket of Caucasus hunter-gatherers who weathered much of the last Ice Age in apparent isolation.[web 1]

All Yamnaya individuals sampled by Haak et al. (2015) belonged to the Y-haplogroup R1b.

Based on these findings and by equating the people of the Yamnaya culture with the Proto-Indo-Europeans, David W. Anthony (2019) suggests that the Proto-Indo-European language formed mainly from a base of languages spoken by Eastern European hunter-gathers with influences from languages of northern Caucasus hunter-gatherers, in addition to a possible later influence from the language of the Maikop culture to the south (which is hypothesized to have belonged to the North Caucasian family) in the later neolithic or Bronze Age involving little genetic impact.[40]

According to Haak et al. (2015), "Eastern European hunter-gatherers" who inhabited Russia were a distinctive population of hunter-gatherers with high affinity to a ~24,000-year-old Siberian from the Mal'ta-Buret' culture, or other, closely related Ancient North Eurasian (ANE) people from Siberia and to the Western Hunter-Gatherers (WHG).[31][web 1] Remains of the "Eastern European hunter-gatherers" have been found in Mesolithic or early Neolithic sites in Karelia and Samara Oblast, Russia, and put under analysis. Three such hunter-gathering individuals of the male sex have had their DNA results published. Each was found to belong to a different Y-DNA haplogroup: R1a, R1b, and J.[33] R1b is also the most common Y-DNA haplogroup found among both the Yamnaya and modern-day Western Europeans. R1a is more common in Eastern Europeans and in the northern parts of the Indian subcontinent. [31][32]

The Near East population were most likely hunter-gatherers from the Caucasus (CHG)[39] c.q. Iran Chalcolithic related people with a major CHG-component.[41]

Jones et al. (2015) analyzed genomes from males from western Georgia, in the Caucasus, from the Late Upper Palaeolithic (13,300 years old) and the Mesolithic (9,700 years old). These two males carried Y-DNA haplogroup: J* and J2a. The researchers found that these Caucasus hunters were probably the source of the farmer-like DNA in the Yamnaya, as the Caucasians were distantly related to the Middle Eastern people who introduced farming in Europe.[web 1] Their genomes showed that a continued mixture of the Caucasians with Middle Eastern took place up to 25,000 years ago, when the coldest period in the last Ice Age started.[web 1]

According to Lazaridis et al. (2016), "a population related to the people of the Iran Chalcolithic contributed ~43% of the ancestry of early Bronze Age populations of the steppe."[41] According to Lazaridis et al. (2016), these Iranian Chalcolithic people were a mixture of "the Neolithic people of western Iran, the Levant, and Caucasus Hunter Gatherers."[41][note 4] Lazaridis et al. (2016) also note that farming spread at two places in the Near East, namely the Levant and Iran, from where it spread, Iranian people spreading to the steppe and south Asia.[42]

Bronze Age spread of Yamnaya Steppe pastoralist ancestry

Haak et al. (2015) studied DNA from 94 skeletons from Europe and Russia aged between 3,000 and 8,000 years old.[43] They concluded that about 4,500 years ago there was a major influx into Europe of Yamnaya culture people originating from the Pontic–Caspian steppe north of the Black Sea and that the DNA of copper-age Europeans matched that of the Yamnaya.[44][31]

The four Corded Ware people could trace an astonishing three-quarters of their ancestry to the Yamnaya, according to the paper. That suggests a massive migration of Yamnaya people from their steppe homeland into Eastern Europe about 4500 years ago when the Corded Ware culture began, perhaps carrying an early form of Indo-European language.

A 2017 archaeogenetics study of Mycenaean and Minoan remains published in the journal Nature concluded that the Mycenaean Greeks were genetically closely related with the Minoans but unlike the Minoans also had a 13–18% genetic contribution from Bronze Age steppe populations.[45][46][47]

Luigi Luca Cavalli-Sforza and Alberto Piazza argue that Renfrew and Gimbutas reinforce rather than contradict each other. Cavalli-Sforza (2000) states that "It 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 Turkey." Piazza & Cavalli-Sforza (2006) state that:

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 unfavourable 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.

Spencer Wells suggests in a 2001 study that the origin, distribution and age of the R1a1 haplotype points to an ancient migration, possibly corresponding to the spread by the Kurgan people in their expansion across the Eurasian steppe around 3000 BC.[48]

About his old teacher Cavalli-Sforza's proposal, Wells (2002:) states that "there is nothing to contradict this model, although the genetic patterns do not provide clear support either", and instead argues that the evidence is much stronger for Gimbutas' model:

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.

David Reich (2018), noting the presence of some Indo-European languages (such as Hittite) in parts of ancient Anatolia, argues that "the most likely location of the population that first spoke an Indo-European language was south of the Caucasus Mountains, perhaps in present-day Iran or Armenia, because ancient DNA from people who lived there matches what we would expect for a source population both for the Yamnaya and for ancient Anatolians." Yet, Reich also notes that "...the evidence here is circumstantial as no ancient DNA from the Hittites themselves has yet been published."[49] Kristian Kristiansen, in an interview with Der Spiegel in May 2018, stated that the Yamnaya culture may have had a predecessor at the Caucasus, where "proto-proto-Indo-European" was spoken.[50]

Recent DNA-research has led to renewed suggestions of a Caucasian homeland for the 'proto-Indo-Europeans'.[31][51][52][53][50] According to Kroonen et al. (2018), Damgaard et al. (2018) ancient Anatolia "show no indication of a large-scale intrusion of a steppe population."[54] They further note that this lends support to the Indo-Hittite hypothesis, according to which both proto-Anatolian and proto-Indo-European split-off from a common mother language "no later than the 4th millennium BCE."[55] Haak et al. (2015) states that "the Armenian plateau hypothesis gains in plausibility" since the Yamnaya partly descended from a Near Eastern population, which resembles present-day Armenians."[31]

Wang et al. (2018) note that the Caucasus served as a corridor for gene flow between the steppe and cultures south of the Caucasus during the Eneolithic and the Bronze Age, stating that this "opens up the possibility of a homeland of PIE south of the Caucasus." However, Wang et al. also comment that the most recent genetic evidence supports an expansion of proto-Indo-Europeans through the steppe, noting: "but the latest ancient DNA results from South Asia also lend weight to a spread of Indo-European languages "via the steppe belt. The spread of some or all of the proto-Indo-European branches would have been possible via the North Caucasus and Pontic region and from there, along with pastoralist expansions, to the heart of Europe. This scenario finds support from the well attested and now widely documented 'steppe ancestry' in European populations, the postulate of increasingly patrilinear societies in the wake of these expansions (exemplified by R1a/R1b), as attested in the latest study on the Bell Beaker phenomenon."[56]

David W. Anthony in a 2019 analysis, criticizes the "southern" or "Armenian" hypothesis (addressing Reich, Kristiansen, and Wang). Among his reasons being: that the Yamnaya lack evidence of genetic influence from the Bronze Age or late neolithic Caucasus (deriving instead from an earlier mixture of Eastern European hunter-gatherers and Caucasus hunter-gatherers) and have paternal lineages that seem to derive from the hunter-gatherers of the Eastern European Steppe rather than the Caucasus, as well as a scarcity in the Yamnaya of the Anatolian Farmer admixture that had become common and substantial in the Caucasus around 5,000 BC. Anthony instead suggests a genetic and linguistic origin of proto-Indo-Europeans (the Yamnaya) in the Eastern European steppe north of the Caucasus, from a mixture of these two groups (EHG and CHG). He suggests that the roots of Proto-Indo-European ("archaic" or proto-proto-Indo-European) were in the steppe rather than the south and that PIE formed mainly from a base of languages spoken by Eastern European hunter-gathers with some influences from languages of Caucasus hunter-gatherers.[57][40]