Celtic languages

Celtic
Geographic distribution	Formerly widespread in much of Europe and central Anatolia; today Cornwall, Wales, Scotland, Ireland, Brittany, the Isle of Man, Chubut Province (Y Wladfa), and Nova Scotia
Linguistic classification	Indo-European Italo-Celtic? Celtic
Proto-language	Proto-Celtic
Subdivisions	Continental Celtic † Insular Celtic
Language codes
ISO 639-2 / 5	cel
Linguasphere	50= (phylozone)
Glottolog	celt1248
Distribution of Celtic speakers:   Hallstatt culture area, 6th century BC   Maximal Celtic expansion, c. 275 BC   Lusitanian area; Celtic affiliation unclear   Areas where Celtic languages were spoken in the Middle Ages   Areas where Celtic languages remain widely spoken today

The Celtic languages (/ˈkɛltɪk/ KEL-tik) are a branch of the Indo-European language family, descended from Proto-Celtic. The term "Celtic" was first used to describe this language group by Edward Lhuyd in 1707, following Paul-Yves Pezron, who made the explicit link between the Celts described by classical writers and the Welsh and Breton languages.

During the first millennium BC, Celtic languages were spoken across much of Europe and central Anatolia. Today, they are restricted to the northwestern fringe of Europe and a few diaspora communities. There are six living languages: the four continuously living languages Breton, Irish, Scottish Gaelic and Welsh, and the two revived languages Cornish and Manx. All are minority languages in their respective countries, though there are continuing efforts at revitalisation. Welsh is an official language in Wales and Irish is an official language of Ireland and of the European Union. Welsh is the only Celtic language not classified as endangered by UNESCO. The Cornish and Manx languages became extinct in modern times but have been revived. Each now has several hundred second-language speakers.

Irish, Manx and Scottish Gaelic form the Goidelic languages, while Welsh, Cornish and Breton are Brittonic. All of these are Insular Celtic languages, since Breton, the only living Celtic language spoken in continental Europe, is descended from the language of settlers from Britain. There are a number of extinct but attested continental Celtic languages, such as Celtiberian, Galatian and Gaulish. Beyond that there is no agreement on the subdivisions of the Celtic language family. They may be divided into P-Celtic and Q-Celtic.

The Celtic languages have a rich literary tradition. The earliest specimens of written Celtic are Lepontic inscriptions from the 6th century BC in the Alps. Early Continental inscriptions used Italic and Paleohispanic scripts. Between the 4th and 8th centuries, Irish and Pictish were occasionally written in an original script, Ogham, but Latin script came to be used for all Celtic languages. Welsh has had a continuous literary tradition from the 6th century AD.

Living languages

SIL Ethnologue lists six living Celtic languages, of which four have retained a substantial number of native speakers. These are: the Goidelic languages (Irish and Scottish Gaelic, both descended from Middle Irish) and the Brittonic languages (Welsh and Breton, descended from Common Brittonic). The other two, Cornish (Brittonic) and Manx (Goidelic), died out in modern times with their presumed last native speakers in 1777 and 1974 respectively. Revitalisation movements in the 2000s led to the reemergence of native speakers for both languages following their adoption by adults and children. By the 21st century, there were roughly one million total speakers of Celtic languages, increasing to 1.4 million speakers by 2010.

Demographics

Language	Native name	Grouping	Number of native speakers	Number of skilled speakers	Area of origin (still spoken)	Regulated by/language body	Estimated number of speakers in major cities
Irish	Gaeilge / Gaedhilg / Gaelainn / Gaeilig / Gaeilic	Goidelic	40,000–80,000 In the Republic of Ireland, 73,803 people use Irish daily outside the education system.	Total speakers: 1,887,437 Republic of Ireland: 1,774,437 United Kingdom: 95,000 United States: 18,000	Gaeltacht of Ireland	Foras na Gaeilge	Dublin: 184,140 Galway: 37,614 Cork: 57,318 Belfast: 14,086
Welsh	Cymraeg / Y Gymraeg	Brittonic	538,000 (17.8% of the population of Wales) claim that they "can speak Welsh" (2021)	Total speakers: ≈ 947,700 (2011) Wales: 788,000 speakers (26.7% of the population) England: 150,000 Chubut Province, Argentina: 5,000 United States: 2,500 Canada: 2,200	Wales	Welsh Language Commissioner The Welsh Government (previously the Welsh Language Board, Bwrdd yr Iaith Gymraeg)	Cardiff: 54,504 Swansea: 45,085 Newport: 18,490 Bangor: 7,190
Breton	Brezhoneg	Brittonic	206,000	356,000	Brittany	Ofis Publik ar Brezhoneg	Rennes: 7,000 Brest: 40,000 Nantes: 4,000
Scottish Gaelic	Gàidhlig	Goidelic	57,375 (2011)	Scotland: 87,056 (2011) Nova Scotia, Canada: 1,275 (2011)	Scotland	Bòrd na Gàidhlig	Glasgow: 5,726 Edinburgh: 3,220 Aberdeen: 1,397
Cornish	Kernowek / Kernewek	Brittonic	563	2,000	Cornwall	Akademi Kernewek Cornish Language Partnership (Keskowethyans an Taves Kernewek)	Truro: 118
Manx	Gaelg / Gailck	Goidelic	100+, including a small number of children who are new native speakers	1,823	Isle of Man	Coonceil ny Gaelgey	Douglas: 507

Mixed languages

• Beurla Reagaird, Highland travellers' language
• Shelta, based largely on Irish and Hiberno-English (some 86,000 speakers in 2009).

Classification

Classification of Celtic languages according to Insular vs. Continental hypothesis. (click to enlarge)

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

The Celtic nations, where Celtic languages are spoken today, or were spoken into the modern era:

  Ireland (Irish)

  Scotland (Scottish Gaelic)

  Isle of Man (Manx)

  Wales (Welsh)

  Cornwall (Cornish)

  Brittany (Breton)

The second of the four Botorrita plaques. The third plaque is the longest text discovered in any ancient Celtic language. However, this plaque is inscribed in Latin script.

Celtic is divided into various branches:

• Lepontic, the oldest attested Celtic language (from the 6th century BC). Anciently spoken in Switzerland and in Northern-Central Italy. Coins with Lepontic inscriptions have been found in Noricum and Gallia Narbonensis.
• Celtiberian, also called Eastern or Northeastern Hispano-Celtic, spoken in the ancient Iberian Peninsula, in the eastern part of Old Castile and south of Aragon. Modern provinces: Segovia, Burgos, Soria, Guadalajara, Cuenca, Zaragoza and Teruel. The relationship of Celtiberian with Gallaecian, in northwest Iberia, is uncertain.
• Gallaecian, also known as Western or Northwestern Hispano-Celtic, anciently spoken in the northwest of the peninsula (modern Northern Portugal, and the Spanish regions of Galicia, Asturias and northwestern Castile and León).
• Gaulish languages, including Galatian and possibly Noric. These were once spoken in a wide arc from Belgium to Turkey. They are now all extinct.
• Brittonic, spoken in Great Britain and Brittany. Including the living languages Breton, Cornish, and Welsh, and the lost Cumbric and Pictish, though Pictish may be a sister language rather than a daughter of Common Brittonic. Before the arrival of Scotti on the Isle of Man in the 9th century, there may have been a Brittonic language there. The theory of a Brittonic Ivernic language predating Goidelic speech in Ireland has been suggested, but is not widely accepted.
• Goidelic, including the extant Irish, Manx, and Scottish Gaelic.

Continental/Insular Celtic and P/Q-Celtic hypotheses

Scholarly handling of Celtic languages has been contentious owing to scarceness of primary source data. Some scholars (such as Cowgill 1975; McCone 1991, 1992; and Schrijver 1995) posit that the primary distinction is between Continental Celtic and Insular Celtic, arguing that the differences between the Goidelic and Brittonic languages arose after these split off from the Continental Celtic languages. Other scholars (such as Schmidt 1988) make the primary distinction between P-Celtic and Q-Celtic languages based on the replacement of initial Q by initial P in some words. Most of the Gallic and Brittonic languages are P-Celtic, while the Goidelic and Hispano-Celtic (or Celtiberian) languages are Q-Celtic. The P-Celtic languages (also called Gallo-Brittonic) are sometimes seen (for example by Koch 1992) as a central innovating area as opposed to the more conservative peripheral Q-Celtic languages. According to Ranko Matasović in the introduction to his 2009 Etymological Dictionary of Proto-Celtic: "Celtiberian ... is almost certainly an independent branch on the Celtic genealogical tree, one that became separated from the others very early."

The Breton language is Brittonic, not Gaulish, though there may be some input from the latter, having been introduced from Southwestern regions of Britain in the post-Roman era and having evolved into Breton.

In the P/Q classification schema, the first language to split off from Proto-Celtic was Gaelic. It has characteristics that some scholars see as archaic, but others see as also being in the Brittonic languages (see Schmidt). In the Insular/Continental classification schema, the split of the former into Gaelic and Brittonic is seen as being late.

The distinction of Celtic into these four sub-families most likely occurred about 900 BC according to Gray & Atkinson but, because of estimation uncertainty, it could be any time between 1200 and 800 BC. However, they only considered Gaelic and Brythonic. A controversial paper by Forster & Toth included Gaulish and put the break-up much earlier at 3200 BC ± 1500 years. They support the Insular Celtic hypothesis. The early Celts were commonly associated with the archaeological Urnfield culture, the Hallstatt culture, and the La Tène culture, though the earlier assumption of association between language and culture is now considered to be less strong.

There are legitimate scholarly arguments for both the Insular Celtic hypothesis and the P-/Q-Celtic hypothesis. Proponents of each schema dispute the accuracy and usefulness of the other's categories. However, since the 1970s the division into Insular and Continental Celtic has become the more widely held view (Cowgill 1975; McCone 1991, 1992; Schrijver 1995), but in the middle of the 1980s, the P-/Q-Celtic theory found new supporters (Lambert 1994), because of the inscription on the Larzac piece of lead (1983), the analysis of which reveals another common phonetical innovation -nm- > -nu (Gaelic ainm / Gaulish anuana, Old Welsh enuein 'names'), that is less accidental than only one. The discovery of a third common innovation would allow the specialists to come to the conclusion of a Gallo-Brittonic dialect (Schmidt 1986; Fleuriot 1986).

The interpretation of this and further evidence is still quite contested, and the main argument for Insular Celtic is connected with the development of verbal morphology and the syntax in Irish and British Celtic, which Schumacher regards as convincing, while he considers the P-Celtic/Q-Celtic division unimportant and treats Gallo-Brittonic as an outdated theory. Stifter affirms that the Gallo-Brittonic view is "out of favour" in the scholarly community as of 2008 and the Insular Celtic hypothesis "widely accepted".

When referring only to the modern Celtic languages, since no Continental Celtic language has living descendants, "Q-Celtic" is equivalent to "Goidelic" and "P-Celtic" is equivalent to "Brittonic".

How the family tree of the Celtic languages is ordered depends on which hypothesis is used:

"Insular Celtic hypothesis"

• Proto-Celtic
  • Continental Celtic †
    • Celtiberian †
    • Gallaecian †
    • Gaulish †
  • Insular Celtic
    • Brittonic
    • Goidelic

"P/Q-Celtic hypothesis"

• Proto-Celtic
  • Q-Celtic
    • Celtiberian †
    • Gallaecian †
    • Goidelic
  • P-Celtic
    • Gaulish †
    • Brittonic

Eska (2010)

Eska evaluates the evidence as supporting the following tree, based on shared innovations, though it is not always clear that the innovations are not areal features. It seems likely that Celtiberian split off before Cisalpine Celtic, but the evidence for this is not robust. On the other hand, the unity of Gaulish, Goidelic, and Brittonic is reasonably secure. Schumacher (2004, p. 86) had already cautiously considered this grouping to be likely genetic, based, among others, on the shared reformation of the sentence-initial, fully inflecting relative pronoun *i̯os, *i̯ā, *i̯od into an uninflected enclitic particle. Eska sees Cisalpine Gaulish as more akin to Lepontic than to Transalpine Gaulish.

• Celtic
  • Hispano-Celtic †
    • Celtiberian †
    • Gallaecian †
  • Nuclear Celtic?
    • Cisalpine Celtic: Lepontic → Cisalpine Gaulish †
    • Core Celtic (secure)
      • Transalpine Gaulish † ("Transalpine Celtic")
      • Insular Celtic
        • Goidelic
        • Brittonic

Eska considers a division of Transalpine–Goidelic–Brittonic into Transalpine and Insular Celtic to be most probable because of the greater number of innovations in Insular Celtic than in P-Celtic, and because the Insular Celtic languages were probably not in great enough contact for those innovations to spread as part of a sprachbund. However, if they have another explanation (such as an SOV substratum language), then it is possible that P-Celtic is a valid clade, and the top branching would be:

• Core Celtic (P-Celtic hypothesis)
  • Goidelic
  • Gallo-Brittonic
    • Transalpine Gaulish ("Transalpine Celtic") †
    • Brittonic

Italo-Celtic

Within the Indo-European family, the Celtic languages have sometimes been placed with the Italic languages in a common Italo-Celtic subfamily. This hypothesis fell somewhat out of favour after reexamination by American linguist Calvert Watkins in 1966. Irrespectively, some scholars such as Ringe, Warnow and Taylor and many others have argued in favour of an Italo-Celtic grouping in 21st century theses.

Characteristics

Although there are many differences between the individual Celtic languages, they do show many family resemblances.

• consonant mutations (Insular Celtic only)
• inflected prepositions (Insular Celtic only)
• two grammatical genders (modern Insular Celtic only; Old Irish and the Continental languages had three genders, although Gaulish may have merged the neuter and masculine in its later forms)
• a vigesimal number system (counting by twenties)
  • Cornish hwetek ha dew ugens "fifty-six" (literally "sixteen and two twenty")
• verb–subject–object (VSO) word order (probably Insular Celtic only)
• an interplay between the subjunctive, future, imperfect, and habitual, to the point that some tenses and moods have ousted others
• an impersonal or autonomous verb form serving as a passive or intransitive
  • Welsh dysgaf "I teach" vs. dysgir "is taught, one teaches"
  • Irish múinim "I teach" vs. múintear "is taught, one teaches"
• no infinitives, replaced by a quasi-nominal verb form called the verbal noun or verbnoun
• frequent use of vowel mutation as a morphological device, e.g. formation of plurals, verbal stems, etc.
• use of preverbal particles to signal either subordination or illocutionary force of the following clause
  • mutation-distinguished subordinators/relativisers
  • particles for negation, interrogation, and occasionally for affirmative declarations
• pronouns positioned between particles and verbs
• lack of simple verb for the imperfective "have" process, with possession conveyed by a composite structure, usually BE + preposition
  • Cornish Yma kath dhymm "I have a cat", literally "there is a cat to me"
  • Welsh Mae cath gyda fi "I have a cat", literally "a cat is with me"
  • Irish Tá cat agam "I have a cat", literally "there is a cat at me"
• use of periphrastic constructions to express verbal tense, voice, or aspectual distinctions
• distinction by function of the two versions of BE verbs traditionally labelled substantive (or existential) and copula
• bifurcated demonstrative structure
• suffixed pronominal supplements, called confirming or supplementary pronouns
• use of singulars or special forms of counted nouns, and use of a singulative suffix to make singular forms from plurals, where older singulars have disappeared

Examples:

Irish: Ná bac le mac an bhacaigh is ní bhacfaidh mac an bhacaigh leat.

(Literal translation) Do not bother with son the beggar's and not will-bother son the beggar's with-you.

• bhacaigh is the genitive of bacach. The igh the result of affection; the ⟨bh⟩ is the lenited form of ⟨b⟩.
• leat is the second person singular inflected form of the preposition le.
• The order is verb–subject–object (VSO) in the second half. Compare this to English or French (and possibly Continental Celtic) which are normally subject–verb–object in word order.

Welsh: pedwar ar bymtheg a phedwar ugain

(Literally) four on fifteen and four twenties

• bymtheg is a mutated form of pymtheg, which is pump ("five") plus deg ("ten"). Likewise, phedwar is a mutated form of pedwar.
• The multiples of ten are deg, ugain, deg ar hugain, deugain, hanner cant, trigain, deg a thrigain, pedwar ugain, deg a phedwar ugain, cant.

Comparison table

The lexical similarity between the different Celtic languages is apparent in their core vocabulary, especially in terms of actual pronunciation. Moreover, the phonetic differences between languages are often the product of regular sound change (i.e. lenition of /b/ into /v/ or Ø).

The table below has words in the modern languages that were inherited direct from Proto-Celtic, as well as a few old borrowings from Latin that made their way into all the daughter languages. There is often a closer match between Welsh, Breton and Cornish on the one hand and Irish, Scottish Gaelic and Manx on the other. For a fuller list of comparisons, see the Swadesh list for Celtic.

English	Brittonic			Goidelic
	Welsh	Breton	Cornish	Irish Gaelic	Scottish Gaelic	Manx
bee	gwenynen	gwenanenn	gwenenen	beach	seillean	shellan
big	mawr	meur	meur	mór	mòr	mooar
dog	ci	ki	ki	madra, gadhar (cú "hound")	cù	coo
fish	pysgodyn†	pesk†	pysk†	iasc	iasg	yeeast
full	llawn	leun	leun	lán	làn	lane
goat	gafr	gavr	gaver	gabhar	gobhar	goayr
house	tŷ	ti	chi	teach, tigh	taigh	thie
lip (anatomical)	gwefus	gweuz	gweus	liopa, beol	bile	meill
mouth of a river	aber	aber	aber	inbhear	inbhir	inver
four	pedwar	pevar	peswar	ceathair, cheithre	ceithir	kiare
night	nos	noz	nos	oíche	oidhche	oie
number†	rhif, nifer†	niver†	niver†	uimhir	àireamh	earroo
three	tri	tri	tri	trí	trì	tree
milk	llaeth†	laezh†	leth†	bainne, leacht	bianne, leachd	bainney
you (sg)	ti	te	ty	tú, thú	thu, tu	oo
star	seren	steredenn	steren	réalta	reult, rionnag	rollage
today	heddiw	hiziv	hedhyw	inniu	an-diugh	jiu
tooth	dant	dant	dans	fiacail, déad	fiacaill, deud	feeackle
(to) fall	cwympo	kouezhañ	kodha	tit(im)	tuit(eam)	tuitt(ym)
(to) smoke	ysmygu	mogediñ, butuniñ	megi	caith(eamh) tobac	smocadh	toghtaney, smookal
(to) whistle	chwibanu	c'hwibanat	hwibana	feadáil	fead	fed
time, weather	amser	amzer	amser "time", kewer "weather"	aimsir	aimsir	emshyr

^{† Borrowings from Latin.}

Examples

Article 1 of the Universal Declaration of Human Rights: All human beings are born free and equal in dignity and rights. They are endowed with reason and conscience and should act towards one another in a spirit of brotherhood.

• Irish: Saolaítear gach duine den chine daonna saor agus comhionann i ndínit agus i gcearta. Tá bua an réasúin agus an choinsiasa acu agus ba cheart dóibh gníomhú i dtreo a chéile i spiorad an bhráithreachais.
• Manx: Ta dagh ooilley pheiagh ruggit seyr as corrym ayns ard-cheim as kiartyn. Ren Jee feoiltaghey resoon as cooinsheanse orroo as by chair daue ymmyrkey ry cheilley myr braaraghyn.
• Scottish Gaelic: Tha gach uile dhuine air a bhreith saor agus co-ionnan ann an urram 's ann an còirichean. Tha iad air am breith le reusan is le cogais agus mar sin bu chòir dhaibh a bhith beò nam measg fhèin ann an spiorad bràthaireil.
• Breton: Dieub ha par en o dellezegezh hag o gwirioù eo ganet an holl dud. Poell ha skiant zo dezho ha dleout a reont bevañ an eil gant egile en ur spered a genvreudeuriezh.
• Cornish: Genys frank ha par yw oll tus an bys yn aga dynita hag yn aga gwiryow. Enduys yns gans reson ha kowses hag y tal dhedha omdhon an eyl orth y gila yn spyrys a vrederedh.
• Welsh: Genir pawb yn rhydd ac yn gydradd â'i gilydd mewn urddas a hawliau. Fe'u cynysgaeddir â rheswm a chydwybod, a dylai pawb ymddwyn y naill at y llall mewn ysbryd cymodlon.

Possible members of the family

Several poorly-documented languages may have been Celtic.

• Ancient Belgian
• Camunic is an extinct language spoken in the first millennium BC in the Val Camonica and Valtellina valleys of the Central Alps. It has recently been proposed that it was a Celtic language.
• Ivernic
• Ligurian, on the Northern Mediterranean Coast straddling the southeast French and northwest Italian coasts, including parts of Tuscany, Elba and Corsica. Xavier Delamarre argues that Ligurian was a Celtic language similar to Gaulish. The Ligurian-Celtic question is also discussed by Barruol (1999). Ancient Ligurian is listed as either Celtic (epigraphic), or Para-Celtic (onomastic).
• Lusitanian, spoken in the area between the Douro and Tagus rivers of western Iberia (a region straddling the present border of Portugal and Spain). Known from only five inscriptions and various place names. It is an Indo-European language and some scholars have proposed that it may be a para-Celtic language that evolved alongside Celtic or formed a dialect continuum or sprachbund with Tartessian and Gallaecian. This is tied to a theory of an Iberian origin for the Celtic languages. It is also possible that the Q-Celtic languages alone, including Goidelic, originated in western Iberia (a theory that was first put forward by Edward Lhuyd in 1707) or shared a common linguistic ancestor with Lusitanian. Secondary evidence for this hypothesis has been found in research by biological scientists, who have identified (1) deep-rooted similarities in human DNA found precisely in both the former Lusitania and Ireland, and; (2) the so-called "Lusitanian distribution" of animals and plants unique to western Iberia and Ireland. Both phenomena are now generally thought to have resulted from human emigration from Iberia to Ireland, in the late Paleolithic or early Mesolithic eras. Other scholars see greater linguistic affinities between Lusitanian, Old Gallo-Italic (particularly with Ligurian) and Old European. Prominent modern linguists such as Ellis Evans, believe Gallaecian-Lusitanian was in fact one same language (not separate languages) of the "P" Celtic variant.
• Rhaetic, spoken in central Switzerland, Tyrol in Austria, and the Alpine regions of northeast Italy. Documented by a limited number of short inscriptions (found through Northern Italy and Western Austria) in two variants of the Etruscan alphabet. Its linguistic categorisation is not clearly established, and it presents a confusing mixture of what appear to be Etruscan, Indo-European, and uncertain other elements. Howard Hayes Scullard argues that Rhaetian was also a Celtic language.
• Tartessian, spoken in the southwest of the Iberia Peninsula (mainly southern Portugal and southwest Spain). Tartessian is known by 95 inscriptions, with the longest having 82 readable signs. John T. Koch argues that Tartessian was also a Celtic language.

See also

• Ogham
• Celts
• Celts (modern)
• A Swadesh list of the modern Celtic languages
• Celtic Congress
• Celtic League
• Continental Celtic languages
• Italo-Celtic
• Language family

References

• Ball, Martin J. & James Fife (ed.) (1993). The Celtic Languages. London: Routledge. ISBN 0-415-01035-7.
• Borsley, Robert D. & Ian Roberts (ed.) (1996). The Syntax of the Celtic Languages: A Comparative Perspective. Cambridge: Cambridge University Press. ISBN 0521481600.
• Cowgill, Warren (1975). "The origins of the Insular Celtic conjunct and absolute verbal endings". In H. Rix (ed.). Flexion und Wortbildung: Akten der V. Fachtagung der Indogermanischen Gesellschaft, Regensburg, 9.–14. September 1973. Wiesbaden: Reichert. pp. 40–70. ISBN 3-920153-40-5.
• Celtic Linguistics, 1700–1850 (2000). London; New York: Routledge. 8 vols comprising 15 texts originally published between 1706 and 1844.
• Forster, Peter; Toth, Alfred (July 2003). "Toward a phylogenetic chronology of ancient Gaulish, Celtic, and Indo-European". Proc. Natl. Acad. Sci. USA. 100 (15): 9079–84. Bibcode:2003PNAS..100.9079F. doi:10.1073/pnas.1331158100. PMC 166441. PMID 12837934.
• Gray, Russell D.; Atkinson, Quentin D. (November 2003). "Language-tree divergence times support the Anatolian theory of Indo-European origin". Nature. 426 (6965): 435–39. Bibcode:2003Natur.426..435G. doi:10.1038/nature02029. PMID 14647380. S2CID 42340.
• Hindley, Reg (1990). The Death of the Irish Language: A Qualified Obituary. Routledge. ISBN 0-415-04339-5.
• Lewis, Henry & Holger Pedersen (1989). A Concise Comparative Celtic Grammar. Göttingen: Vandenhoeck & Ruprecht. ISBN 3-525-26102-0.
• McCone, Kim (1991). "The PIE stops and syllabic nasals in Celtic". Studia Celtica Japonica. 4: 37–69.
• McCone, Kim (1992). "Relative Chronologie: Keltisch". In R. Beekes; A. Lubotsky; J. Weitenberg (eds.). Rekonstruktion und relative Chronologie: Akten Der VIII. Fachtagung Der Indogermanischen Gesellschaft, Leiden, 31 August – 4 September 1987. Institut für Sprachwissenschaft der Universität Innsbruck. pp. 12–39. ISBN 3-85124-613-6.
• McCone, Kim (1996). Towards a Relative Chronology of Ancient and Medieval Celtic Sound Change. Maynooth: Department of Old and Middle Irish, St. Patrick's College. ISBN 0-901519-40-5.
• Russell, Paul (1995). An Introduction to the Celtic Languages. Longman. ISBN 0582100828.
• Schmidt, K. H. (1988). "On the reconstruction of Proto-Celtic". In G. W. MacLennan (ed.). Proceedings of the First North American Congress of Celtic Studies, Ottawa 1986. Ottawa: Chair of Celtic Studies. pp. 231–48. ISBN 0-09-693260-0.
• Schrijver, Peter (1995). Studies in British Celtic historical phonology. Amsterdam: Rodopi. ISBN 90-5183-820-4.
• Schumacher, Stefan; Schulze-Thulin, Britta; aan de Wiel, Caroline (2004). Die keltischen Primärverben. Ein vergleichendes, etymologisches und morphologisches Lexikon (in German). Innsbruck: Institut für Sprachen und Kulturen der Universität Innsbruck. ISBN 3-85124-692-6.

Further reading

• Markey, Thomas L. (2006). "Early Celticity in Slovenia and at Rhaetic Magrè (Schio)". Linguistica. 46 (1): 145–72. doi:10.4312/linguistica.46.1.145-172..
• Sims-Williams, Patrick (2020). "An Alternative to 'Celtic from the East' and 'Celtic from the West'". Cambridge Archaeological Journal. 30 (3): 511–29. doi:10.1017/S0959774320000098. hdl:2160/317fdc72-f7ad-4a66-8335-db8f5d911437. S2CID 216484936..
• Stifter, David (April 2020). "The early Celtic epigraphic evidence and early literacy in Germanic languages". NOWELE: North-Western European Language Evolution. 73 (1): 123–152. doi:10.1075/nowele.00037.sti. ISSN 0108-8416. S2CID 219024967.

External links

• Aberdeen University Celtic Department Archived 8 December 2008 at the Wayback Machine
• "Labara: An Introduction to the Celtic Languages", by Meredith Richard
• Celts and Celtic Languages (PDF)