The Proto-Indo-European homeland was the prehistoric homeland of the Proto-Indo-European language (PIE), the region where the proto-language was spoken before it split into the dialects from which the earliest Indo-European languages later evolved with the Indo-European migrations. The Steppe theory, the Anatolian model, and the Near Eastern (or Armenian) model are the three main solutions for the Indo-European homeland, of which the Steppe theory is the most widely accepted proposal.
The search for the homeland of the Indo-Europeans began during the late 18th century with the discovery of the Indo-European language family. The methods used to establish the homeland have been drawn from the disciplines of historical linguistics, archaeology, physical anthropology and, more recently, human population genetics. The Steppe theory puts the archaic, early, and late PIE homeland in the Pontic–Caspian steppe between 4000–3000 BCE. with Lazaridis and Anthony proposing that archaic PIE ('Indo-Anatolian') emerged in an area between the Caucasus and the lower Volga (a region centered on the southwestern steppe just north of the Caucasus) 4400–4000 BCE.
A second possibility is the Anatolian hypothesis, which puts it in Anatolia , but is incompatible with the genetic and linguistic data and has been "largely abandoned". A third group of proposals suggest an archaic PIE-homeland south of the Caucasus. This includes the Armenian hypothesis, which situates the homeland for archaic PIE ('Indo-Hittite') south of the Caucasus mountains, This hypothesis has gained renewed attention during the 2010s and 2020s due to aDNA research, which has resulted in various proposals for an archaic 'Indo-Anatolian' or 'Indo-Hittite' homeland south of the Caucasus or even in Iran, with Lazaridis and Anthony eventually proposing PIE emerged in an area between the Caucasus and the lower Volga.
Several other explanations have been proposed, including eastern Caspian origins, the outdated but historically prominent North European hypothesis, the Neolithic creolisation hypothesis, the Paleolithic continuity paradigm, the Arctic theory, and the "indigenous Aryans" (or "out of India") hypothesis. These are not widely accepted, and are considered to be fringe theories.
Theoretical considerations and constraints for homeland-proposals Traditionally, homelands of linguistic families are proposed based on evidence from comparative linguistics coupled with evidence of historical populations and migrations from archaeology. Presently, genetics via DNA samples is increasingly used for the study of ancient population movements.
Reconstructed vocabulary Using comparative linguistics it is possible to reconstruct the vocabulary found in the proto-language, and in this way achieve some knowledge of the cultural, technological and ecological context that the speakers inhabited. Such a context can then be compared with archaeological evidence. This vocabulary includes, in the case of (late) PIE, which is based on the post-Anatolian and post-Tocharian IE-languages: pastoralism, including domesticated cattle, horses, and dogs agriculture and cereal cultivation, including technology commonly ascribed to late-Neolithic farming communities, e.g., plows. a climate with winter snow "The Indo-Europeans knew snow in their homeland; the word sneigwh- is nearly ubiquitous." transportation by or across water the solid wheel used for wagons, but not yet chariots with spoked wheels. Zsolt Simon notes that, although it can be useful to determine the period when the Proto-Indo-European language was spoken, using the reconstructed vocabulary to locate the homeland may be flawed, since we do not know whether Proto-Indo-European speakers knew a specific concept because it was part of their environment or because they had heard of it from other peoples they were interacting with.
Uralic, Caucasian and Semitic borrowings Proto-Finno-Ugric and PIE have a lexicon in common, generally related to trade, such as words for "price" and "draw, lead". Similarly, "sell" and "wash" were borrowed in Proto-Ugric. Although some have proposed a common ancestor (the hypothetical Indo-Uralic language family), this is generally regarded as the result of intensive borrowing, which suggests that their homelands were located near each other. Proto-Indo-European also exhibits lexical loans to or from Caucasian languages, particularly Proto-Northwest Caucasian and Proto-Kartvelian, which suggests a location close to the Caucasus mountains.
Gamkrelidze and Ivanov, using the now largely unsupported glottalic theory of Indo-European phonology, also proposed Semitic borrowings into Proto-Indo-European, suggesting a more southern homeland to explain these borrowings. According to Mallory and Adams, some of these borrowings may be too speculative or from a later date, but they consider the proposed Semitic loans *táwros 'bull' and *wéyh₁on- 'wine; vine' to be more likely.
Anthony notes that the small number of Semitic loanwords in Proto-Indo-European that are generally accepted by linguists, such as words for bull and silver, could have been borrowed via trade and migration routes rather than through direct contact with the Semitic linguistic homeland.
Genesis of Indo-European languages
Phases of Proto-Indo-European According to Anthony, the following terminology may be used: Archaic PIE for "the last common ancestor of the Anatolian and non-Anatolian IE branches"; Early, or Post-Anatolian, PIE for "the last common ancestor of the non-Anatolian PIE languages, including Tocharian"; Late PIE for "the common ancestor of all other IE branches".
The Anatolian languages are the first Indo-European language family to have been separated from the main group. Due to the archaic elements preserved in the Anatolian languages, they may be a "cousin" of Proto-Indo-European, instead of a "child", but Anatolian is generally regarded as an early offshoot of the Indo-European language group.
The Indo-Hittite hypothesis postulates a common predecessor for both the Anatolian languages and the other Indo-European languages, termed Indo-Hittite or Indo-Anatolian. Although PIE had predecessors, according to Melchert (2012) the Indo-Hittite hypothesis is not widely accepted, and there is little to suggest that it is possible to reconstruct a proto-Indo-Hittite stage that differs substantially from what is already reconstructed for PIE.
Anthony (2019) suggests a derivation of the proto-Indo-European language mainly from a base of languages spoken by Eastern European Hunter-Gatherers living in the Volga steppes, with influences from languages spoken by northern Caucasus hunter-gatherers who migrated from the Caucasus to the lower Volga basin, in addition to a possible later and lesser influence from the language of the Maikop culture to the south (which is hypothesized to have belonged to the North Caucasian family) during the later Neolithic or Bronze Age involving little genetic effect. Lazaridis and Anthony (2025) have reinvigorated Indo-Anatolian with their proposal of an archaic PIE homeland between the Caucasus and the lower Volga with Indo-Anatolian emerging between 4400 and 4000 BCE.
Phylogenetic analyses of languages Lexico-statistical studies intended to show the relationship between the various branches of Indo-European languages began during the late 20th century with work by Dyen et al. (1992) and Ringe et al. (2002).Chang et al (2015), p. 198. Subsequently, a number of authors performed a Bayesian phylogenetic analysis of the IE languages (a mathematical method used for evolutionary biology to establish relationships between species).These included Rexová et al. (2003); Gray and Atkinson (2003); Nakhleh et al. (2005); Blažek (2007); Nicholls and Gray (2008); Bouckaert et al. (2012); Müller et al. (2013); Chang et al. (2015); and most recently Kassian et al. (2021). A secondary intent of these studies was to attempt to estimate the approximate dates at which the various branches separated from each other.
The earlier studies tended to estimate a relatively long time-frame for the development of the different branches. In particular the study by Bouckaert and colleagues (which included a geographical element) was "decisively" in favour of Anatolia as the geographical origin, and assisted Colin Renfrew's hypothesis that Indo-European spread from Anatolia along with agriculture from 7500 to 6000 BCE onwards. According to their analysis, the five major Indo-European subfamilies – Celtic, Germanic, Italic, Balto-Slavic and Indo-Iranian – all emerged as distinct lineages between 4000 and 2000 BCE. The authors stated that this time-scale is consistent with secondary movements such as the expansion of the steppe peoples after 3000 BCE, which they suggest also played a role in the spread of Indo-European languages.
Using models of Bayesian phylogenetic inference, Heggarty et al. (2023) suggest that Indo-European languages emerged 8000 years before present (6000 BCE).
Steppe theory
The steppe hypothesis seeks to identify the source of the Indo-European language expansion which resulted in a succession of migrations from the Pontic–Caspian steppe between the 5th and 3rd millennia BCE. During the early 1980s, a mainstream consensus had emerged among Indo-Europeanists in favour of the "Kurgan hypothesis" (named after the kurgans, burial mounds, of the Eurasian steppes) placing the Indo-European homeland in the Pontic–Caspian steppe of the Chalcolithic.
According to linguist Allan R. Bomhard (2019), the steppe hypothesis proposed by archeologists Marija Gimbutas and David W. Anthony "is supported not only by linguistic evidence, but also by a growing body of archeological and genetic evidence. The Indo-Europeans have been identified with several cultural complexes existing in that area between 4500 and 3500 BCE. The literature supporting such a homeland is both extensive and persuasive [...]. Consequently, other scenarios regarding the possible Indo-European homeland, such as Anatolia, have now been mostly abandoned," although critical issues such as the way the proto-Greek, proto-Armenian, proto-Albanian, proto-Celtic, and proto-Anatolian languages became spoken in their attested homeland are still debated within the context of the steppe model.
Gimbutas's Kurgan hypothesis
According to the Kurgan hypothesis as formulated by Gimbutas, Indo-European speaking nomads from Eastern Ukraine and Southern Russia expanded on horseback in several waves during the 3rd millennium BCE, invading and subjugating supposedly peaceful European Neolithic farmers of Gimbutas's Old Europe. Later versions of Gimbutas's hypothesis increasingly emphasized the patriarchal and patrilineal nature of the invading culture, in contrast with the supposedly egalitarian and matrilineal culture of the invaded.
Archaeology
The archaeologist J. P. Mallory, dating the migrations to c. 4000 BCE, and having less insistence on their violent or quasi-military nature, essentially modified Gimbutas's theory making it compatible with a less gender-political narrative. David Anthony, emphasizing mostly the evidence for the domestication of horses and the presence of wheeled vehicles, came to regard specifically the Yamnaya culture, which replaced the Sredny Stog culture about 3500 BCE, as the most likely candidate for the Proto-Indo-European speech community.