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Indo-European topics

Indo-European languages (list)
Albanian · Armenian · Baltic
Celtic · Germanic · Greek
Indo-Iranian (Indo-Aryan, Iranian)
Italic · Slavic  

extinct: Anatolian · Paleo-Balkans (Dacian,
Phrygian, Thracian) · Tocharian

Indo-European peoples
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Asia: Anatolians (Hittites, Luwians)  · Armenians  · Indo-Iranians (Iranians · Indo-Aryans)  · Tocharians  

Language · Society · Religion
Urheimat hypotheses
Kurgan hypothesis
Anatolia · Armenia · India · PCT
Indo-European studies

The Proto-Indo-European language (PIE) is the unattested, reconstructed common ancestor of the Indo-European languages, spoken by the Proto-Indo-Europeans. The existence of such a language has been accepted by linguists for over a century, and there have been many attempts at reconstruction. Nevertheless, many disagreements and uncertainties remain.


Discovery and reconstruction

Classification of Indo-European languages. (click to enlarge)

Historical and geographical setting

There are several competing hypotheses about when and where PIE was spoken. The Kurgan hypothesis is "the single most popular" model,[1][2] postulating that the Kurgan culture of the Pontic steppe were the hypothesized speakers of the reconstructed Proto-Indo-European language. However, alternative theories such as the Anatolian urheimat and Armenian hypothesis have also gained acceptance.

The satemization process that resulted in the Centum-Satem isogloss probably started as early as the fourth millennium BC[3] and the only thing known for certain is that the proto language must have been differentiated into unconnected daughter dialects by the late 3rd millennium BC.

Mainstream linguistic estimates of the time between PIE and the earliest attested texts (ca. nineteenth century BC; see Kültepe texts) range around 1,500 to 2,500 years, with extreme proposals diverging up to another 100% on either side. Other than the aforementioned, predominant Kurgan hypothesis, proposed models include:


Indo-European studies began with Sir William Jones making and propagating the observation that Sanskrit bore a certain resemblance to classical Greek and Latin. In The Sanscrit Language (1786) he suggested that all three languages had a common root, and that indeed they may all be further related, in turn, to Gothic and the Celtic languages, as well as to Persian.

His third annual discourse before the Asiatic Society on the history and culture of the Hindus (delivered on 2 February 1786 and published in 1788) with the famed "philologer" passage is often cited as the beginning of comparative linguistics and Indo-European studies. This is Jones' most quoted passage, establishing his tremendous find in the history of linguistics:

The Sanscrit language, whatever be its antiquity, is of a wonderful structure; more perfect than the Greek, more copious than the Latin, and more exquisitely refined than either, yet bearing to both of them a stronger affinity, both in the roots of verbs and the forms of grammar, than could possibly have been produced by accident; so strong indeed, that no philologer could examine them all three, without believing them to have sprung from some common source, which, perhaps, no longer exists; there is a similar reason, though not quite so forcible, for supposing that both the Gothic and the Celtic, though blended with a very different idiom, had the same origin with the Sanscrit; and the old Persian might be added to the same family.

This common source came to be known as Proto-Indo-European.

The classical phase of Indo-European comparative linguistics leads from Franz Bopp's Comparative Grammar (1833) to August Schleicher's 1861 Compendium and up to Karl Brugmann's Grundriss published from the 1880s. Brugmann's junggrammatische re-evaluation of the field and Ferdinand de Saussure's development of the laryngeal theory may be considered the beginning of "contemporary" Indo-European studies.

PIE as described in the early 1900s is still generally accepted today; subsequent work is largely refinement and systematization, as well as the incorporation of new information, notably the Anatolian and Tocharian branches unknown in the 19th century.

Notably, the laryngeal theory, in its early forms discussed since the 1880s, became mainstream after Jerzy Kuryłowicz's 1927 discovery of the survival of at least some of these hypothetical phonemes in Anatolian. Julius Pokorny's Indogermanisches etymologisches Wörterbuch (1959) gave an overview of the lexical knowledge accumulated until the early 20th century, but neglected contemporary trends of morphology and phonology, and largely ignored Anatolian and Tocharian.

The generation of Indo-Europeanists active in the last third of the 20th century (such as Calvert Watkins, Jochem Schindler and Helmut Rix) developed a better understanding of morphology and, in the wake of Kuryłowicz's 1956 Apophonie, understanding of the ablaut. From the 1960s, knowledge of Anatolian became certain enough to establish its relationship to PIE; see also Indo-Hittite.


There is no direct evidence of PIE, because it was never written. All PIE sounds and words are reconstructed from later Indo-European languages using the comparative method and the method of internal reconstruction. An asterisk is used to mark reconstructed PIE words, such as *wódr̥ 'water', *ḱwṓn 'dog' (English hound), or *tréyes 'three (masculine)'. Many of the words in the modern Indo-European languages seem to have derived from such "protowords" via regular sound changes (e.g., Grimm's law).

As the Proto-Indo-European language broke up, its sound system diverged as well, according to various sound laws in the daughter languages. Notable among these are Grimm's law and Verner's law in Proto-Germanic, loss of prevocalic *p- in Proto-Celtic, reduction to h of prevocalic *s- in Proto-Greek, Brugmann's law and Bartholomae's law in Proto-Indo-Iranian, Grassmann's law independently in both Proto-Greek and Proto-Indo-Iranian, and Winter's law and Hirt's law in Balto-Slavic.

Relationships to other language families

Proposed genetic connections

Many higher-level relationships between Proto-Indo-European and other language families have been proposed, but these hypothesized connections are highly controversial. A proposal often considered to be the most plausible of these is that of an Indo-Uralic family, encompassing PIE and Uralic. The evidence usually cited in favor of this consists in a number of striking morphological and lexical resemblances. Opponents attribute the lexical resemblances to borrowing from Indo-European into Uralic. Frederik Kortlandt, while advocating a connection, concedes that "the gap between Uralic and Indo-European is huge", while Lyle Campbell, an authority on Uralic, denies any relationship exists.

Other proposals, further back in time (and proportionately less accepted), link Indo-European and Uralic with Altaic and the other language families of northern Eurasia, namely Yukaghir, Korean, Japanese, Chukotko-Kamchatkan, Nivkh, Ainu, and Eskimo-Aleut, but excluding Yeniseian (the most comprehensive such proposal is Joseph Greenberg's Eurasiatic), or link Indo-European, Uralic, and Altaic to Afro-Asiatic and Dravidian (the traditional form of the Nostratic hypothesis), and ultimately to a single Proto-Human family.

A more rarely mentioned proposal associates Indo-European with the Northwest Caucasian languages in a family called Proto-Pontic.

Etruscan shows some similarities to Indo-European. There is no consensus on whether these are due to a genetic relationship, borrowing, chance and sound symbolism, or some combination of these.

Proposed areal connections

The existence of certain PIE typological features in Northwest Caucasian languages may hint at an early Sprachbund[5] or substratum that reached geographically to the PIE homelands.[6] This same type of languages, featuring complex verbs and of which the current Northwest Caucasian languages might have been the sole survivors, was cited by Peter Schrijver to indicate a local lexical and typological reminiscence in western Europe pointing to a possible Neolithic substratum.[7]



Labial Coronal Dorsal Laryngeal
palatal plain labial
Nasal *m *n


*p *t *ḱ *k *kʷ  
voiced *b *d *g *gʷ  
aspirated *bʰ *dʰ *ǵʰ *gʰ *gʷʰ  
Fricative *s *h₁, *h₂, *h₃
Liquid *r, *l
Semivowel *y *w

Alternative notations: The aspirated plosives are sometimes written as *bh, *dh, *ǵh, *gh, *gʷh; for the palatals, *k̑, *g̑ are often used; and *i̯, *u̯ can replace *y, *w.

The pronunciation of the laryngeals is disputed, at least *h₁ might not have been a fricative.


  • Short vowels: *e, *o (and possibly *a).
  • Long vowels: , (and possibly ). Sometimes a colon (:) is employed instead of the macron sign to indicate vowel length (*a:, *e:, *o:).
  • Diphthongs: *ei, *eu, *ēi, *ēu, *oi, *ou, *ōi, *ōu, (*ai, *au, *āi, *āu). Diphthongs are sometimes understood as combinations of a vowel plus a semivowel, e. g. *ey or *ei̯ instead of *ei.[8]
  • Vocalic allophones of laryngeals, nasals, liquids and semivowels: *h̥₁, *h̥₂, *h̥₃, *m̥, *n̥, *l̥, *r̥, *i, *u.
  • Long variants of these vocalic allophones may have appeared already in the proto-language by compensatory lengthening (for example of a vowel plus a laryngeal): *m̥̄, *n̥̄, *l̥̄, *r̥̄, *ī, *ū.

It is often suggested that all *a and were earlier derived from an *e preceded or followed by *h₂, but Mayrhofer[9] has argued that PIE did in fact have *a and phonemes independent of h₂.



PIE was an inflected language, in which the grammatical relationships between words were signaled through inflectional morphemes (usually endings). The roots of PIE are basic morphemes carrying a lexical meaning. By addition of suffixes, they form stems, and by addition of desinences (usually endings), these form grammatically inflected words (nouns or verbs). PIE roots are understood to be predominantly monosyllabic with a basic shape CvC(C). This basic root shape is often altered by ablaut. Roots which appear to be vowel initial are believed by many scholars to have originally begun with a set of consonants, later lost in all but the Anatolian branch, called laryngeals (usually indicated *H, and often specified with a subscript number *h₁, *h₂, *h₃). Thus a verb form such as the one reflected in Latin agunt, Greek ἄγουσι (ágousi), Sanskrit ajanti would be reconstructed as *h₂eǵ-onti, with the element *h₂eǵ- constituting the root per se.


One of the distinctive aspects of PIE was its ablaut sequence that contrasted the vowel phonemes *o / *e / Ø [no vowel] within the same root. Ablaut is a form of vowel variation which changed between these three forms perhaps depending on the adjacent sounds and placement of stress in the word. These changes are echoed in modern Indo-European languages where they have come to reflect grammatical categories. These ablaut grades are usually referred to as: e-grade and o-grade, sometimes collectively termed full grade; zero-grade (no vowel, Ø); and lengthened grade ( or ). Modern English sing, sang, sung is an example of such an ablaut set and reflects a pre-Proto-Germanic sequence *sengw-, *songw-, *sngw-. Some scholars believe that the inflectional affixes of Indo European reflect ablaut variants, usually zero-grade, of older PIE roots. Often the zero-grade appears where the word's accent has shifted from the root to one of the affixes. Thus the alternation found in Latin est, sunt reflects PIE *h₁és-ti, *h₁s-ónti.


Proto-Indo-European nouns were declined for eight or nine cases (nominative, accusative, genitive, dative, instrumental, ablative, locative, vocative, and possibly a directive or allative).[10] There were three genders: masculine, feminine, and neuter.

There are two major types of declension, thematic and athematic. Thematic nominal stems are formed with a suffix *-o- (in vocative *-e) and the stem does not undergo ablaut. The athematic stems are more archaic, and they are classified further by their ablaut behaviour (acro-dynamic, protero-dynamic, hystero-dynamic and holo-dynamic, after the positioning of the early PIE accent (dynamis) in the paradigm).


PIE pronouns are difficult to reconstruct owing to their variety in later languages. This is especially the case for demonstrative pronouns. PIE had personal pronouns in the first and second person, but not the third person, where demonstratives were used instead. The personal pronouns had their own unique forms and endings, and some had two distinct stems; this is most obvious in the first person singular, where the two stems are still preserved in English I and me. According to Beekes,[11] there were also two varieties for the accusative, genitive and dative cases, a stressed and an enclitic form.

Personal pronouns (Beekes)
First person Second person
Singular Plural Singular Plural
Nominative *h₁eǵ(oH/Hom) *wei *tuH *yuH
Accusative *h₁mé, *h₁me *nsmé, *nōs *twé *usmé, *wōs
Genitive *h₁méne, *h₁moi *ns(er)o-, *nos *tewe, *toi *yus(er)o-, *wos
Dative *h₁méǵʰio, *h₁moi *nsmei, *ns *tébʰio, *toi *usmei
Instrumental *h₁moí ? *toí ?
Ablative *h₁med *nsmed *tued *usmed
Locative *h₁moí *nsmi *toí *usmi

As for demonstratives, Beekes tentatively reconstructs a system with only two pronouns: *so / *seh₂ / *tod "this, that" and *h₁e / *(h₁)ih₂ / *(h₁)id "the (just named)" (anaphoric). He also postulates three adverbial particles *ḱi "here", *h₂en "there" and *h₂eu "away, again", from which demonstratives were constructed in various later languages.


The Indo-European verb system is complex and, as the noun, exhibits a system of ablaut. Verbs have at least four moods (indicative, imperative, subjunctive and optative, as well as possibly the injunctive, reconstructible from Vedic Sanskrit), two voices (active and mediopassive), as well as three persons (first, second and third) and three numbers (singular, dual and plural). Verbs are conjugated in at least three "tenses" (present, aorist, and perfect), which actually have primarily aspectual value. Indicative forms of the imperfect and (less likely) the pluperfect may have existed. Verbs were also marked by a highly developed system of participles, one for each combination of tense and mood, and an assorted array of verbal nouns and adjectival formations.

Buck[12] Beekes[11]
Athematic Thematic Athematic Thematic
Singular 1st *-mi *-ō *-mi *-oH
2nd *-si *-esi *-si *-eh₁i
3rd *-ti *-eti *-ti *-e
Plural 1st *-mos/mes *-omos/omes *-mes *-omom
2nd *-te *-ete *-th₁e *-eth₁e
3rd *-nti *-onti *-nti *-o


The Proto-Indo-European numerals are generally reconstructed as follows:

Sihler[13] Beekes[11]
one *Hoi-no-/*Hoi-wo-/*Hoi-k(ʷ)o-; *sem- *Hoi(H)nos
two *d(u)wo- *duoh₁
three *trei- (full grade) / *tri- (zero grade) *treies
four *kʷetwor- (o-grade) / *kʷetur- (zero grade)
(see also the kʷetwóres rule)
five *penkʷe *penkʷe
six *s(w)eḱs; originally perhaps *weḱs *(s)uéks
seven *septm̥ *séptm
eight *oḱtō, *oḱtou or *h₃eḱtō, *h₃eḱtou *h₃eḱteh₃
nine *(h₁)newn̥ *(h₁)néun
ten *deḱm̥(t) *déḱmt
twenty *wīḱm̥t-; originally perhaps *widḱomt- *duidḱmti
thirty *trīḱomt-; originally perhaps *tridḱomt- *trih₂dḱomth₂
forty *kʷetwr̥̄ḱomt-; originally perhaps *kʷetwr̥dḱomt- *kʷeturdḱomth₂
fifty *penkʷēḱomt-; originally perhaps *penkʷedḱomt- *penkʷedḱomth₂
sixty *s(w)eḱsḱomt-; originally perhaps *weḱsdḱomt- *ueksdḱomth₂
seventy *septm̥̄ḱomt-; originally perhaps *septm̥dḱomt- *septmdḱomth₂
eighty *oḱtō(u)ḱomt-; originally perhaps *h₃eḱto(u)dḱomt- *h₃eḱth₃dḱomth₂
ninety *(h₁)newn̥̄ḱomt-; originally perhaps *h₁newn̥dḱomt- *h₁neundḱomth₂
hundred *ḱm̥tom; originally perhaps *dḱm̥tom *dḱmtóm
thousand *ǵheslo-; *tusdḱomti *ǵʰes-l-

Lehmann[14] believes that the numbers greater than ten were constructed separately in the dialects groups and that *ḱm̥tóm originally meant "a large number" rather than specifically "one hundred."


Many particles could be used both as adverbs and postpositions, like *upo "under, below". The postpositions became prepositions in most daughter languages. Other reconstructible particles include negators (*ne, *mē), conjunctions (*kʷe "and", *wē "or" and others) and an interjection (*wai!, an expression of woe or agony).

Sample texts

As PIE was spoken by a prehistoric society, no genuine sample texts are available, but since the 19th century modern scholars have made various attempts to compose example texts for purposes of illustration. These texts are educated guesses at best; Calvert Watkins in 1969 observes that in spite of its 150 years' history, comparative linguistics is not in the position to reconstruct a single well-formed sentence in PIE. Nevertheless, such texts do have the merit of giving an impression of what a coherent utterance in PIE might have sounded like.

Published PIE sample texts:


  1. ^ Mallory (1989:185). "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 Encyclopaedia Britannica and the Grand Dictionnaire Encyclopédique Larousse."
  2. ^ Strazny (2000:163). "The single most popular proposal is the Pontic steppes (see the Kurgan hypothesis)..."
  3. ^ ".. the satemization process can be dated to the last centuries of the fourth millennium." [1] THE SPREAD OF THE INDO-EUROPEANS -Frederik Kortlandt.
  4. ^ Russell D. Gray and Quentin D. Atkinson, Language-tree divergence times support the Anatolian theory of Indo-European origin, Nature 426 (27 November 2003) 435-439
  6. ^ [3] The spread of the Indo-Europeans - Frederik Kortlandt, 1989
  7. ^ [4] Peter Schrijver - Keltisch en de buren: 9000 jaar taalcontact, University of Utrecht, March 2007.
  8. ^ Rix, H. Lexikon der indogermanischen Verben (2 ed.). 
  9. ^ Mayrhofer 1986: 170 ff.
  10. ^ Fortson IV, Benjamin W. (2004). Indo-European Language and Culture. Blackwell Publishing. pp. 102. ISBN 1-4051-0316-7. 
  11. ^ a b c Beekes, Robert S. P. (1995). Comparative Indo-European Linguistics: An Introduction. ISBN 1-55619-505-1. 
  12. ^ Buck, Carl Darling (1933). Comparative Grammar of Greek and Latin. Chicago: University of Chicago Press. ISBN 0-226-07931-7. 
  13. ^ Sihler, Andrew L. (1995). New Comparative Grammar of Greek and Latin. Oxford University Press. pp. 402–24. ISBN 0-19-508345-8. 
  14. ^ Lehmann, Winfried P. (1993). Theoretical Bases of Indo-European Linguistics. London: Routledge. pp. 252–255. ISBN 0-415-08201-3. 

See also

Daughter proto-languages


  • Beekes, Robert S. P. (1995). Comparative Indo-European Linguistics: An Introduction. Amsterdam: John Benjamins. ISBN 90-272-2150-2 (Europe), ISBN 1-55619-504-4 (U.S.). 
  • James Clackson (2007). Indo-European Linguistics: An Introduction (Cambridge Textbooks in Linguistics). Cambridge: Cambridge University Press. ISBN 0-52165-313-4. 
  • Buck, Carl Darling (1933). Comparative Grammar of Greek and Latin. Chicago: University of Chicago Press. ISBN 0-226-07931-7. 
  • Lehmann, W., and L. Zgusta. 1979. Schleicher's tale after a century. In Festschrift for Oswald Szemerényi on the Occasion of his 65th Birthday, ed. B. Brogyanyi, 455–66. Amsterdam.
  • Mallory, J.P., (1989). In Search of the Indo-Europeans London: Thames and Hudson. ISBN 0-500-27616-1
  • Mayrhofer, Manfred (1986). Indogermanische Grammatik, i/2: Lautlehre. Heidelberg: Winter. 
  • Mallory, J. P.; Adams, D. Q. (2006), The Oxford Introduction to Proto-Indo-European and the Proto-Indo-European World, Oxford: Oxford University Press, ISBN 0199296682 
  • Meier-Brügger, Michael (2003). Indo-European Linguistics. New York: de Gruyter. ISBN 3-11-017433-2. 
  • Renfrew, Colin (1987). Archaeology & Language. The Puzzle of the Indo-European Origins. London: Jonathan Cape. ISBN 0-224-02495-7
  • Sihler, Andrew L. (1995). New Comparative Grammar of Greek and Latin. Oxford: Oxford University Press. ISBN 0-19-508345-8. 
  • Szemerényi, Oswald (1996). Introduction to Indo-European Linguistics. Oxford. 
  • Vyacheslav V. Ivanov and Thomas Gamkrelidze, The Early History of Indo-European Languages, Scientific American, vol. 262, N3, 110116, March, 1990
  • Whitney, William Dwight (1889). Sanskrit Grammar. Harvard University Press. ISBN 81-208-0621-2 (India), ISBN 0-486-43136-3 (Dover, US). 
  • Remys, Edmund, General distinguishing features of various Indo-European languages and their relationship to Lithuanian, Indogermanische Forschungen, Walter de Gruyter, Berlin, New York, Band 112, 2007.

External links

Simple English

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The Proto-Indo-European language (PIE) is the hypothetical common language that was spoken before the Indo-European languages developed.


Discovery and reconstruction

There are several competing hypotheses about when and where PIE was spoken.[1]

The idea that there was such a language was supported by the fact, that in 1927 Jerzy Kuryłowicz discovered some of the phonemes, one supposed to be Proto-Indo-European in Anatolian.


There is no direct evidence of PIE, because it was never written. All PIE sounds and words are reconstructed from later Indo-European languages using the comparative method and the method of internal reconstruction. The asterisk is used to mark reconstructed PIE words, such as *wódr̥ 'water', *ḱwṓn 'dog', or *tréyes 'three (masculine)'. Many of the words in the modern Indo-European languages seem to have derived from such "protowords" via regular sound changes (e.g., Grimm's law).


Proto-Indo-European consonants (traditional transcription)
CONSONANTS Labials Coronals Palatovelars Velars Labiovelars Laryngeals
Voiceless stops p t k  
Voiced stops b d ǵ g  
Aspirated stops ǵʰ gʷʰ  
Nasals m n
Fricatives s h₁, h₂, h₃
Liquids, Glides w r, l j
  • Short vowels a, e, i, o, u
  • Long vowels ā, ē, ō; sometimes a colon (:) is employed to indicate vowel length instead of the macron sign (a:, e:, o:).
  • Diphthongs ai, au, āi, āu, ei, eu, ēi, ēu, oi, ou, ōi, ōu
  • vocalic allophones of consonantal phonemes: u, i, r̥, l̥, m̥, n̥.

Other long vowels may have appeared already in the proto-language by compensatory lengthening: ī, ū, r̥̄, l̥̄, m̥̄, n̥̄.

Published PIE sample texts:

  • Schleicher's fable (avis akvasas ka) by August Schleicher (1868), modernized by Hermann Hirt (1939) and Winfred Lehmann and Ladislav Zgusta (1979)
  • The king and the god (rēḱs deiwos-kʷe) by S. K. Sen and E. P. Hamp (1994)

Other pages


Further reading

  • Vyacheslav V. Ivanov and Thomas Gamkrelidze, The early history of Indo-­European Languages. Scientific American, 262, March, 1990
  • A. Kammenhuber. 1968. Aryans in the Near East. Heidelberg.
  • Beekes, Robert S.P. (1995). Comparative Indo-European linguistics: an introduction. Amsterdam: John Benjamins. ISBN 90-272-2150-2 (Europe), ISBN 1-55619-504-4 (U.S.). 
  • Buck, Carl Darling (1933). Comparative grammar of Greek and Latin. Chicago: University of Chicago Press. ISBN 0-226-07931-7. 
  • Lehmann W. and L. Zgusta 1979. Schleicher's tale after a century. In Festschrift for Oswald Szemerényi on the Occasion of his 65th Birthday, ed. B. Brogyanyi, 455–66. Amsterdam.
  • Mayrhofer, Manfred (1986). Indogermanische Grammatik, i/2: Lautlehre. Heidelberg: Winter. 
  • Sihler, Andrew L. (1995). New Comparative Grammar of Greek and Latin. Oxford: Oxford University Press. ISBN 0-19-508345-8. 
  • Szemerényi, Oswald (1996). Introduction to Indo-European Linguistics. Oxford. 
  • Whitney, William Dwight (1924). Comparative grammar of Greek and Latin. Delhi: Motilal Banarsidass Publishers Private Limited (reprint). ISBN 81-208-0621-2 (India), ISBN 0-486-43136-3 (Dover, US). 

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