Armenian hypothesis

Recent DNA-research (2015–2018) has led to renewed suggestions of a Caucasian homeland for a 'proto-proto-Indo-European'.[3][4][5][6][7] It also has been proposed by some to lend 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."[10]

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. Yet, they also state that "the question of what languages were spoken by the 'Eastern European Hunter-Gatherers' and the southern, Armenian-like, ancestral population remains open."[27]

David Reich, in his 2018 publication Who We Are and How We Got Here, noting the presence of some Indo-European languages (such as Hittite) in parts of ancient Anatolia, states 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."[4] Nevertheless, Reich also states that some, if not most, of the Indo-European languages were spread by the Yamnaya people.[28]

According to Kroonen et al. (2018), Damgaard et al. (2018) aDNA studies in Anatolia "show no indication of a large-scale intrusion of a steppe population", but do "fit the recently developed consensus among linguists and historians that the speakers of the Anatolian languages established themselves in Anatolia by gradual infiltration and cultural assimilation."[29] 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."[10]

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."[30] However, Wang et al. also acknowledge that according to genetic evidence, an origin of the Proto-Indo-European language in the North Pontic/Caucasus region is possible, noting:

latest ancient DNA results from South Asia suggest an LMBA spread via the steppe belt. Irrespective of the early branching pattern, the spread of some or all of the PIE branches would have been possible via the North Pontic/Caucasus region and from there, along with pastoralist expansions, to the heart of Europe. This scenario finds support from the well attested and widely documented ‘steppe ancestry’ in European populations and the postulate of increasingly patrilinear societies in the wake of these expansions.[31]

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.[7]

Lazaridis et al. (2022) outline genetic evidence for Reich and Wang's "south of the Caucasus" model. The authors suggest a primary Indo-Anatolian homeland in Western Asia and/or the Caucasus, with the Eurasian steppe serving as a secondary Indo-European homeland after the Anatolian branch split off.[32]

J. Grepin wrote in a review (1986) in the Times Literary Supplement the model of linguistic relationships is "the most complex, far reaching and fully supported of this century".[33]

Robert Drews says (as published in 1988) that "most of the chronological and historical arguments seem fragile at best, and of those that I am able to judge, some are evidently wrong". However, he argues that it is far more powerful as a linguistic model, providing insights into the relationship between the Indo-European and the Semitic and Kartvelian languages.[25]

David Anthony in a 2019 analysis also criticizes the "southern" or Armenian hypothesis (replying to Reich, Kristiansen, and Wang). He finds that the Yamnaya derived mainly from Eastern European hunter-gatherers (EHG) and Caucasus hunter-gatherers (CHG), and 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. Anthony argues that the roots of proto-Indo-European formed mainly from a base of languages spoken by Eastern European hunter-gatherers, with some influences from the languages of Caucasus hunter-gatherers. According to Anthony, hunting-fishing camps from the lower Volga, dated 6200–4500 BCE, could be the remains of people who contributed the CHG-component, migrating from the south-east Caucasus, who mixed with EHG-people from the north Volga steppes. The resulting culture contributed to the Sredny Stog culture, a predecessor of the Yamnaya culture.[34] Anthony cites evidence from ancient DNA, that the Bronze Age Maykop people of the Caucasus (previously proposed as a possible southern source of language and genetics at the root of Indo-European), had little genetic impact on the Yamnaya (whose paternal lineages differ from those found in Maykop remains, but are instead related to those of pre-Yamnaya Eastern European steppe hunter-gatherers). In addition, the Maykop (and other contemporary Caucasus samples), along with CHG, had significant Anatolian Farmer ancestry "which had spread into the Caucasus from the west after about 5000 BC", but is little detected in the Yamnaya. Partly for these reasons, Anthony concludes that Bronze Age Caucasus groups such as the Maykop "played only a minor role, if any, in the formation of Yamnaya ancestry." According to Anthony, this, the absence of evidence of significant admixture (including of paternal genetic influence, often associated with language shift) from the south on the Yamnaya suggests that the roots of Proto-Indo-European (archaic or proto-proto-Indo-European) were mainly in the steppe rather than the south. Anthony considers it likely that the Maykop spoke a Northern Caucasian language not ancestral to Indo-European.[35]