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Indo-Iranian peoples, also known as Indo-Iranic peoples by scholars, and sometimes as Aryans from their self-designation, are a grouping of ethnic groups consisting of the Indo-Aryan, Iranian and Nuristani peoples; that is, speakers of Indo-Iranian languages, a major branch of the Indo-European language family.
The Proto-Indo-Iranians are commonly identified with the descendants of the Proto-Indo-Europeans known as the Sintashta culture and the subsequent Andronovo culture within the broader Andronovo horizon, and their homeland with an area of the Eurasian steppe that borders the Ural River on the west, the Tian Shan on the east.
The term Aryan has generally been used historically to denote the Indo-Iranians because Arya is the self designation of the Indo-Iranian languages and their speakers, specifically the Iranian and the Indo-Aryan peoples, collectively known as the Indo-Iranians. Some scholars now use the term Indo-Iranian to refer to this group, while the term "Aryan" is used to mean "Indo-Iranian" by other scholars such as Josef Wiesehofer and Jaakko Häkkinen. Population geneticist Luigi Luca Cavalli-Sforza, in his 1994 book The History and Geography of Human Genes, also uses the term Aryan to describe the Indo-Iranians.
The early Indo-Iranians are commonly identified with the descendants of the Proto-Indo-Europeans known as the Sintashta culture and the subsequent Andronovo culture within the broader Andronovo horizon, and their homeland with an area of the Eurasian steppe that borders the Ural River on the west, the Tian Shan on the east. Historical linguists broadly estimate that a continuum of Indo-Iranian languages probably began to diverge by 2000 BC, if not earlier,:38–39 preceding both the Vedic and Iranian cultures. The earliest recorded forms of these languages, Vedic Sanskrit and Gathic Avestan, are remarkably similar, descended from the common Proto–Indo-Iranian language. The origin and earliest relationship between the Nuristani languages and that of the Iranian and Indo-Aryan groups is complex.
R1a1a (R-M17 or R-M198) sub-clade is the one most commonly associated with Indo-European speakers. Most discussions purportedly of R1a origins are actually about the origins of the dominant R1a1a (R-M17 or R-M198) sub-clade. Data so far collected indicates that there are two widely separated areas of high frequency, one in South Asia, around North India, and the other in Eastern Europe, around Poland and Ukraine. 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.
Out of 10 human male remains assigned to the Andronovo horizon from the Krasnoyarsk region, 9 possessed the R1a Y-chromosome haplogroup and one C-M130 haplogroup (xC3). mtDNA haplogroups of nine individuals assigned to the same Andronovo horizon and region were as follows: U4 (2 individuals), U2e, U5a1, Z, T1, T4, H, and K2b.
90% of the Bronze Age period mtDNA haplogroups were of west Eurasian origin and the study determined that at least 60% of the individuals overall (out of the 26 Bronze and Iron Age human remains' samples of the study that could be tested) had light hair and blue or green eyes.
A 2004 study also established that during the Bronze Age/Iron Age period, the majority of the population of Kazakhstan (part of the Andronovo culture during Bronze Age), was of west Eurasian origin (with mtDNA haplogroups such as U, H, HV, T, I and W), and that prior to the 13th–7th century BCE, all Kazakh samples belonged to European lineages.
Two-wave models of Indo-Iranian expansion have been proposed by  and Parpola (1999). The Indo-Iranians and their expansion are strongly associated with the Proto-Indo-European invention of the chariot. It is assumed that this expansion spread from the Proto-Indo-European homeland north of the Caspian sea south to the Caucasus, Central Asia, the Iranian plateau, and Northern India. They also expanded into Mesopotamia and Syria and introduced the horse and chariot culture to this part of the world. Sumerian texts from EDIIIb Girsu (2500–2350 BC) already mention the 'chariot' (gigir) and Ur III texts (2150–2000 BC) mention the horse (anshe-zi-zi).
First wave - Indo-Aryans
Anatolia - Hittites and Mittani
They left linguistic remains in a Hittite horse-training manual written by one "Kikkuli the Mitannian". Other evidence is found in references to the names of Mitanni rulers and the gods they swore by in treaties; these remains are found in the archives of the Mitanni's neighbors. The time period for this is about 1500 BC.:257 In a treaty between the Hittites and the Mitanni, the deities Mitra, Varuna, Indra, and Nasatya (Ashvins) are invoked. Kikkuli's horse training text includes technical terms such as aika (eka, one), tera (tri, three), panza (pancha, five; compare with Gr. pente), satta (sapta, seven), na (nava, nine; compare with Lat. novem), vartana (vartana, turn, round in the horse race; compare with Lat. vertere, vortex). The numeral aika "one" is of particular importance because it places the superstrate in the vicinity of Indo-Aryan proper as opposed to Indo-Iranian or early Iranian (which has "aiva") in general.
Indian Subcontinent- Vedic culture
The standard model for the entry of the Indo-European languages into South Asia is that this first wave went over the Hindu Kush, either into the headwaters of the Indus and later the Ganges. The earliest stratum of Vedic Sanskrit, preserved only in the Rigveda, is assigned to roughly 1500 BC.:258 From the Indus, the Indo-Aryan languages spread from c. 1500 BC to c. 500 BC, over the northern and central parts of the subcontinent, sparing the extreme south. The Indo-Aryans in these areas established several powerful kingdoms and principalities in the region, from eastern Afghanistan to the doorstep of Bengal. The most powerful of these kingdoms were the post-Rigvedic Kuru (in Kurukshetra and the Delhi area) and their allies the Pañcālas further east, as well as Gandhara and later on, about the time of the Buddha, the kingdom of Kosala and the quickly expanding realm of Magadha. The latter lasted until the 4th century BC, when it was conquered by Chandragupta Maurya and formed the center of the Mauryan empire.
In eastern Afghanistan and southwestern Pakistan, whatever Indo-Aryan languages were spoken there were eventually pushed out by the Iranian languages. Most Indo-Aryan languages, however, were and still are prominent in the rest of the Indian subcontinent. Today, Indo-Aryan languages are spoken in India, Pakistan, Bangladesh, Nepal, Sri Lanka, Fiji and the Maldives.
The second wave is interpreted as the Iranian wave.:42–43 The first Iranians to reach the Black Sea may have been the Cimmerians in the 8th century BC, although their linguistic affiliation is uncertain. They were followed by the Scythians, who are considered a western branch of the Central Asian Sakas. Sarmatian tribes, of whom the best known are the Roxolani (Rhoxolani), Iazyges (Jazyges) and the Alani (Alans), followed the Scythians westwards into Europe in the late centuries BCE and the 1st and 2nd centuries of the Common Era (The Age of Migrations). The populous Sarmatian tribe of the Massagetae, dwelling near the Caspian Sea, were known to the early rulers of Persia in the Achaemenid Period. In the east, the Saka occupied several areas in Xinjiang, from Khotan to Tumshuq.
The Medes, Parthians and Persians begin to appear on the Iranian plateau from c. 800 BC, and the Achaemenids replaced Elamite rule from 559 BC. Around the first millennium of the Common Era (AD), the Kambojas, the Pashtuns and the Baloch began to settle on the eastern edge of the Iranian plateau, on the mountainous frontier of northwestern and western Pakistan, displacing the earlier Indo-Aryans from the area.
In Central Asia, the Turkic languages have marginalized Iranian languages as a result of the Turkic expansion of the early centuries AD. Extant major Iranian languages are Persian, Pashto, Kurdish, and Balochi besides numerous smaller ones.
Archaeological cultures associated with Indo-Iranian expansion include:
- Poltavka culture (2700–2100 BC)
- Central Asia
- India (middle Ganges plains)
- Painted Gray Ware culture (1100–350 BC)
- Early West Iranian Grey Ware (1500–1000 BC)
- Late West Iranian Buff Ware (900–700 BC)
- Indo-Pak sub-continent
Parpola (1999) suggests the following identifications:
|date range||archaeological culture||identification suggested by Parpola|
|2800–2000 BC||late Catacomb and Poltavka cultures||late PIE to Proto–Indo-Iranian|
|2000–1800 BC||Srubna and Abashevo cultures||Proto-Iranian|
|1900–1700 BC||BMAC||"Proto-Dasa" Indo-Aryans establishing themselves in the existing BMAC settlements, defeated by "Proto-Rigvedic" Indo-Aryans around 1700|
|1900–1400 BC||Cemetery H||Indian Dasa|
|1800–1000 BC||Alakul-Fedorovo||Indo-Aryan, including "Proto–Sauma-Aryan" practicing the Soma cult|
|1700–1400 BC||early Swat culture||Proto-Rigvedic = Proto-Dardic|
|1700–1500 BC||late BMAC||"Proto–Sauma-Dasa", assimilation of Proto-Dasa and Proto–Sauma-Aryan|
|1500–1000 BC||Early West Iranian Grey Ware||Mitanni-Aryan (offshoot of "Proto–Sauma-Dasa")|
|1400–800 BC||late Swat culture and Punjab, Painted Grey Ware||late Rigvedic|
|1400–1100 BC||Yaz II-III, Seistan||Proto-Avestan|
|1100–1000 BC||Gurgan Buff Ware, Late West Iranian Buff Ware||Proto-Persian, Proto-Median|
|1000–400 BC||Iron Age cultures of Xinjang||Proto-Saka|
On the other hand the affiliation of BMAC to indo-Iranian culture is seriously questionable and can be disputed by archaeological analysis.
A significant section of the archaeologists are more inclined to see the culture as begun by farmers in the Near Eastern Neolithic tradition, but infiltrated by Indo-Iranian speakers from the Andronovo culture in its late phase, creating a hybrid. In this perspective, Proto-Indo-Aryan developed within the composite culture before moving south into the Indian subcontinent.  As James P. Mallory phrased it:
It has become increasingly clear that if one wishes to argue for Indo-Iranian migrations from the steppe lands south into the historical seats of the Iranians and Indo-Aryans that these steppe cultures were transformed as they passed through a membrane of Central Asian urbanism. The fact that typical steppe wares are found on BMAC sites and that intrusive BMAC material is subsequently found further to the south in Iran, Afghanistan, Nepal, India and Pakistan, may suggest then the subsequent movement of Indo-Iranian-speakers after they had adopted the culture of the BMAC.
The Indian archaeologist B. B. Lal has seriously questioned the BMAC and Indo-Iranian connection, and disputed the proclaimed relations. Others maintain there is insufficient evidence for any ethnic or linguistic identification of the BMAC solely based on material remains, in the absence of written records. 
The Indo-European language spoken by the Indo-Iranians in the late 3rd millennium BC was a Satem language still not removed very far from the Proto–Indo-European language, and in turn only removed by a few centuries from the Vedic Sanskrit of the Rigveda. The main phonological change separating Proto–Indo-Iranian from Proto–Indo-European is the collapse of the ablauting vowels *e, *o, *a into a single vowel, Proto–Indo-Iranian *a (but see Brugmann's law). Grassmann's law and Bartholomae's law were also complete in Proto–Indo-Iranian, as well as the loss of the labiovelars (kw, etc.) to k, and the Eastern Indo-European (Satem) shift from palatized k' to ć, as in Proto–Indo-European *k'ṃto- > Indo-Iran. *ćata- > Sanskrit śata-, Old Iran. sata "100".
- The "Aryan" Language, Gherardo Gnoli, Instituto Italiano per l'Africa e l'Oriente, Roma, 2002.
- . Schmitt, "Aryans" in Encyclopedia Iranica: Excerpt:"The name “Aryan” (OInd. ā́rya-, Ir. *arya- [with short a-], in Old Pers. ariya-, Av. airiia-, etc.) is the self designation of the peoples of Ancient India and Ancient Iran who spoke Aryan languages, in contrast to the “non-Aryan” peoples of those “Aryan” countries (cf. OInd. an-ā́rya-, Av. an-airiia-, etc.), and lives on in ethnic names like Alan (Lat. Alani, NPers. īrān, Oss. Ir and Iron.". Also accessed online:  in May,2010
- Wiesehofer, Joseph Ancient Persia New York:1996 I.B. Tauris—Recommends the use by scholars of the term Aryan to describe the Eastern, not the Western, branch of the Indo-European peoples (See "Aryan" in index)
- Durant, Will Our Oriental Heritage New York:1954 Simon and Schuster—According to Will Durant on Page 286: “the name Aryan first appears in the [name] Harri, one of the tribes of the Mitanni. In general it was the self-given appellation of the tribes living near or coming from the [southern] shores of the Caspian sea. The term is properly applied today chiefly to the Mitannians, Hittites, Medes, Persians, and Vedic Hindus, i.e., only to the eastern branch of the Indo-European peoples, whose western branch populated Europe.”
- Häkkinen, Jaakko (2012). "Early contacts between Uralic and Yukaghir". In Tiina Hyytiäinen, Lotta Jalava, Janne Saarikivi, Erika Sandman. Per Urales ad Orientem (Festschrift for Juha Janhunen on the occasion of his 60th birthday on 12 February 2012) (PDF). Helsinki: Finno-Ugric Society. ISBN 978-952-5667-34-9. Retrieved 12 November 2013.
- Häkkinen, Jaakko (23 September 2012). "Problems in the method and interpretations of the computational phylogenetics based on linguistic data - An example of wishful thinking: Bouckaert et al. 2012" (PDF). Jaakko Häkkisen puolikuiva alkuperäsivusto. Jaakko Häkkinen. Retrieved 12 November 2013.
- Cavalli-Sforza, Luigi Luca; Menozzi, Paolo; Piazza, Alberto (1994), The History and Geography of Human Genes, Princeton, New Jersey: Princeton University Press, p. See "Aryan" in index, ISBN 978-0-691-08750-4
- Mallory 1989
-  C. Keyser et al. 2009. Ancient DNA provides new insights into the history of south Siberian Kurgan people. Human Genetics.
-  C. Lalueza-Fox et al. 2004. Unravelling migrations in the steppe: mitochondrial DNA sequences from ancient central Asians
- Christopher I. Beckwith (2009), Empires of the Silk Road, Oxford University Press, p.30
- Burrow 1973.
- Mallory & Mair 2000
- Rigveda – Britannica Online Encyclopedia
- C.C. Lamberg-Karlovsky, "Archaeology and Language: The Indo-Iranians", Current Anthropology, vol. 43, no. 1 (Feb. 2002).
- David Anthony, The Horse, the Wheel and Language (2007), pp.452–56.
- Mallory, J. P.; Adams, D. Q. (1997). "BMAC". Encyclopedia of Indo-European Culture. London: Fitzroy Dearborn. ISBN 1-884964-98-2.
- "B.B. Lal 19th Century Paradigms". Archaeologyonline.net. Retrieved 2012-08-15.
- Francfort H.-P. in Fussman, G.; Kellens, J.; Francfort, H.-P.; Tremblay, X. 2005; Bryant 2001.
- Burrow, T. (1973), "The Proto-Indoaryans", Journal of the Royal Asiatic Society NS2: 123-140
- Diakonoff, Igor M.; Kuz'mina, E. E.; Ivantchik, Askold I. (1995), "Two Recent Studies of Indo-Iranian Origins", Journal of the American Oriental Society (American Oriental Society) 115 (3): 473–477, doi:10.2307/606224, JSTOR 606224.
- Jones-Bley, K.; Zdanovich, D. G. (eds.), Complex Societies of Central Eurasia from the 3rd to the 1st Millennium BC, 2 vols, JIES Monograph Series Nos. 45, 46, Washington D.C. (2002), ISBN 0-941694-83-6, ISBN 0-941694-86-0.
- Kuz'mina, Elena Efimovna (1994), Откуда пришли индоарии? (Whence came the Indo-Aryans), Moscow: Российская академия наук (Russian Academy of Sciences).
- Kuz'mina, Elena Efimovna (2007), Mallory, James Patrick, ed., The Origin of the Indo-Iranians, Leiden Indo-European Etymological Dictionary Series, Leiden: Brill
- Mallory, J.P. (1989), In Search of the Indo-Europeans: Language, Archaeology, and Myth, London: Thames & Hudson.
- Mallory, J. P.; Adams, Douglas Q. (1997), "Indo-Iranian Languages", Encyclopedia of Indo-European Culture, Fitzroy Dearborn.
- Mallory, J. P.; Mair, Victor H. (2000), The Tarim Mummies: Ancient China and the Mystery of the Earliest People from the West, London: Thames & Hudson.
- Parpola, Asko (1999), "The formation of the Aryan branch of Indo-European", in Blench, Roger; Spriggs, Matthew, Archaeology and Language, III: Artefacts, languages and texts, London and New York: Routledge.
- Sulimirski, Tadeusz (1970), Daniel, Glyn, ed., The Sarmatians, Ancient People and Places, Thames & Hudson, ISBN 0-500-02071-X
- Witzel, Michael (2000), "The Home of the Aryans" (PDF), in Hintze, A.; Tichy, E., Anusantatyai. Fs. für Johanna Narten zum 70. Geburtstag, Dettelbach: J.H. Roell, pp. 283–338.
FOR FURTHER READING:
- Chopra, R. M., "Indo-Iranian Cultural Relations Through The Ages", Iran Society, Kolkata, 2005.
- The Origin of the Pre-Imperial Iranian People by Oric Basirov (2001)
- The Origin of the Indo-Iranians Elena E. Kuz'mina. Edited by J.P. Mallory (2007)