The Celtic languages form one of the most distinctive and best documented of the branches of the Indo-European language family, a group of tongues that at its peak was spoken from Ireland to Galatia in central Anatolia, from Scotland to the Alps, and that has left an indelible mark on the place names, personal names, and cultural identities of modern Europe. To study the Celtic language family is to trace one of the great linguistic stories of the ancient and medieval world, the story of a community of related languages that at its height included several million speakers, that lost most of its continental territory to the expansion of Latin and to the migrations of Germanic and Slavic-speaking peoples, and that survived into the present as a small but remarkably resilient group of minority languages whose continuing existence is a testament to the endurance of the cultures that speak them. These languages are the foundation of the rich medieval Celtic literary tradition and of the inscribed record preserved in Ogham and other early scripts, both of which are essential to the broader story of Celtic languages and oral tradition.
The Celtic languages are conventionally divided into two main branches, the continental Celtic languages, all of which are now extinct as living languages, and the insular Celtic languages, which are still spoken in the British Isles and, through medieval migration, in Brittany. The two branches share a common ancestor, proto-Celtic, which is itself descended from an earlier Indo-European language spoken in the prehistoric period.
The Indo-European Background
The Celtic languages belong to the Indo-European language family, the great grouping of related languages that includes most of the languages of Europe, the Iranian plateau, and the northern Indian subcontinent. Within Indo-European, the Celtic languages are most closely related to the Italic languages, the Germanic languages, and the Balto-Slavic languages, with the Italo-Celtic hypothesis suggesting an even closer prehistoric relationship between Celtic and Italic than is reflected in the later languages.
The Celtic languages share a number of distinctive features that set them apart from other Indo-European branches. The most famous of these is the loss of the original Indo-European p sound, a sound change that distinguishes Celtic from most other Indo-European languages. The word for father, for example, is piter in Latin, patēr in Greek, and athair in Old Irish (with the original p replaced by a vowel), and the word for five is quīnque in Latin, pénte in Greek, and cóic in Old Irish.
The Celtic languages also have a system of consonant mutations, in which the initial consonant of a word changes under certain grammatical and syntactic conditions. The system of lenition, the system of nasalization, and the system of eclipsis are all characteristic of the Celtic languages. The closest parallel to the Celtic system of initial mutations is found in the Semitic languages, although the two systems arose independently.
The verb system of the Celtic languages is also distinctive, with a strong tendency to use verbal nouns where other Indo-European languages use an infinitive, with a complex set of absolute and relative verb forms, and with a number of unusual constructions. The Celtic verb system preserves several features of the older Indo-European system that have been lost in most other branches.
Proto-Celtic and the Emergence of the Family
The earliest evidence for the Celtic languages as a separate group comes from the late Bronze Age or early Iron Age, when the speakers of proto-Celtic began to develop the features that would later distinguish Celtic from the other Indo-European languages. The exact date and location of this emergence is debated, but it is generally thought to have occurred sometime in the second millennium BCE, in central Europe, and the spread of the Celtic languages into western Europe probably accompanied the La Tène expansion of the early Iron Age.
The reconstruction of proto-Celtic, the common ancestor of all the Celtic languages, is one of the great achievements of historical linguistics. The reconstructed proto-Celtic vocabulary includes words for wheel (rotā), for iron (*īsarno-), for lake (*lokwo-), and for king (rīgos), as well as the distinctive -āko and -acon place-name elements. The major sound changes from proto-Celtic to the attested Celtic languages are among the most thoroughly documented in the history of the Indo-European languages.
The earliest attested Celtic language is Lepontic, known from inscriptions of the sixth century BCE in northern Italy and Switzerland. The Lepontic inscriptions, although short, are clearly Celtic in character and represent the earliest evidence for the Celtic languages in the historical record.
The Continental Celtic Languages
The continental Celtic languages are entirely extinct as living languages, but they are known from a substantial body of evidence. Gaulish, the most extensively documented of the continental Celtic languages, was spoken across Gaul and parts of northern Italy, the Balkans, and central Europe in the Iron Age and the Roman period. The Gaulish corpus includes hundreds of inscriptions, a substantial body of personal names and place names, a small number of coin legends, and a few longer texts. The most famous Gaulish text is the Larzac tablet, a lead curse tablet from the second century CE found in southern France, which contains a substantial Gaulish text in the Latin alphabet and gives a vivid picture of the Gaulish language in the late Roman period.
Celtiberian, the Celtic language of north-central Spain, is known from a substantial corpus of bronze inscriptions dating from the second and first centuries BCE. The Celtiberian inscriptions, although often difficult to interpret, include some of the longest Celtic texts from the ancient world, and they provide important evidence for the early development of the q and p sounds that distinguish the Goidelic and Brythonic branches. The Celtiberian texts from Botorrita (the ancient Contrebia Belaisca) are particularly important, including a bronze plaque with a long Celtiberian text in the Latin alphabet.
Lepontic, the oldest attested Celtic language, is known from inscriptions of the sixth century BCE in northern Italy, particularly around the Lago Maggiore region. The Lepontic inscriptions, although short, show features that are archaic compared with other Celtic languages, including the preservation of certain Indo-European sounds that were lost elsewhere in Celtic. Galatian, the Celtic language of central Anatolia spoken by the descendants of the Celtic migrants of the third century BCE, is known mainly from a small number of personal names and from a single short Greek-language text containing Galatian words. The Galatian inscriptions and personal names are particularly important for what they reveal about the migration of Celtic-speaking peoples into the Mediterranean world.
Other continental Celtic languages went into decline with the Roman conquest and the spread of Latin, and by the early medieval period only a few relicts survived in remote regions.
The Insular Celtic Languages
The insular Celtic languages are divided into two main sub-branches. The Goidelic, or Q-Celtic, branch includes Irish, Scottish Gaelic, and Manx, all of which preserve a k (or q) sound in words where the Brythonic languages have a p. The Brythonic, or P-Celtic, branch includes Welsh, Cornish, Breton, and the extinct Cumbric of the old kingdom of Strathclyde, all of which share a common ancestor usually called Common Brythonic. The split between Goidelic and Brythonic is generally dated to the late Bronze Age or early Iron Age.
Irish, the oldest of the insular Celtic languages, has the longest continuous literary tradition of any Celtic language. The earliest Old Irish texts date from the seventh and eighth centuries CE, although the material they contain is often much older, and the manuscript tradition that preserves them includes works from the early medieval period through the modern era. Modern Irish is one of the official languages of the Republic of Ireland and is recognized as a minority language in Northern Ireland, with a substantial body of modern literature in the language.
Scottish Gaelic, the Goidelic language of the Scottish Highlands and the Hebrides, has a literary tradition that begins in the late medieval period. The earliest major text is the Book of the Dean of Lismore, a manuscript compiled in the early sixteenth century that contains a substantial collection of Gaelic poetry, much of it composed centuries earlier. Modern Scottish Gaelic has a small but active community of speakers in the Western Isles and the western Highlands.
Manx, the Goidelic language of the Isle of Man, declined through the nineteenth and twentieth centuries and was effectively extinct as a community language by the mid-twentieth century. Since the late twentieth century, however, Manx has been studied as a vigorous revival. The Manx language has a small but interesting medieval and early modern literary tradition, including the Manx Chronicle and the folk songs of the Manx countryside.
Welsh, the Brythonic language of Wales, is the most widely spoken of the Celtic languages today, with more than half a million speakers in Wales and substantial Welsh-speaking communities in other parts of the United Kingdom, in Patagonia, and in the United States. The earliest Welsh texts, including the Old Welsh glosses of the eighth and ninth centuries, show that the Brythonic language of Wales was already well developed as a literary medium by the time of the Anglo-Saxon settlement. The great Mabinogion, a collection of prose tales preserved in the Red Book of Hergest and the White Book of Rhydderch of the fourteenth century, draws on a much older oral tradition that probably goes back to the early medieval period.
Breton, the Brythonic language of Brittany, has a much more limited manuscript tradition than Welsh or Irish, but it preserves a number of medieval texts, including the Life of Saint Columba and a small number of religious and literary works. The Breton oral tradition preserves a great deal of older material, and the gwerz, a form of Breton ballad, preserves stories of heroes, saints, and historical figures that often have older parallels in the Welsh and Cornish traditions. Modern Breton has a substantial community of speakers in western Brittany.
Cornish, the Brythonic language of Cornwall, has a limited medieval manuscript tradition, but it preserves a few important texts including the Ordinalia, a cycle of medieval mystery plays. Cornish declined through the early modern period and was effectively extinct by the late eighteenth century, although it has since been revived. The Cornish revival has produced a small but active community of speakers and a substantial body of modern literature in the language.
Cumbric, the Brythonic language of the old kingdom of Strathclyde and the southwestern Scottish lowlands, is known mainly from place names, personal names, and a small number of glosses, and it appears to have been extinct by the twelfth century. The Cumbric evidence is particularly important for the reconstruction of Common Brythonic and for the understanding of the relationship between Welsh, Cornish, Breton, and the older Brythonic language of northern Britain.
Pictish, the language of the Picts of northern and eastern Scotland before and during the early medieval period, is known only from a small and difficult body of evidence: a handful of inscriptions on stone, a small number of place names and personal names, and a few late medieval notes that may preserve older forms. The classification of Pictish is one of the most intractable problems in Celtic linguistics. The older view, that Pictish was a non-Indo-European language related to Basque, has now been largely abandoned. The current scholarly view is that Pictish is most likely a Celtic language, possibly a member of the Brythonic branch, but the evidence is not strong enough to allow a confident classification, and some scholars have proposed that Pictish may have been a Q-Celtic language distinct from Goidelic or Brythonic.
The Continental and Insular Relationship
The relationship between the continental and the insular Celtic languages important questions in Celtic linguistics. The two branches share the basic features of Celtic, including the loss of the Indo-European p, the system of consonant mutations, and the distinctive verb system, but they also differ in important ways. The most striking difference is the treatment of the original kw sound, which becomes p in the Brythonic branch and k (or c) in the Goidelic branch, and which appears in the continental languages as p in some positions and kw in others. The kw/p split has been studied as a long-running debate, and the answer to the question depends partly on the reconstruction of proto-Celtic and partly on the interpretation of the continental evidence.
The traditional view is that the continental Celtic languages were most closely related to the Brythonic branch of insular Celtic, and that the Goidelic branch represents a separate migration of Celtic-speaking peoples into Ireland. A more recent view, proposed especially by the linguist John Koch and others, is that the P-Celtic sound change (from kw to p) is an areal feature that spread from the continent to the Brythonic-speaking regions of Britain, and that the Goidelic branch is the older and more conservative branch of insular Celtic.
Celtic Substratum in the Romance and Germanic Languages
The Celtic languages have left substantial traces in the languages that succeeded them in the territories where they were once spoken. Latin, the language that displaced Celtic in Gaul, Iberia, and most of the Roman Celtic world, borrowed a number of Celtic words and may have absorbed some Celtic syntactic and phonological features, particularly in the spoken Latin of Gaul. The place names of Gaul, Spain, and other formerly Celtic-speaking regions preserve a rich Celtic inheritance, including river names, town names, and tribal names that are still in use in their original Celtic forms, in Latinized forms, or in modern French and Spanish adaptations.
The Germanic languages, particularly Old English, also show traces of Celtic contact, particularly in the place names of England and Scotland, and the personal names of the Anglo-Saxon tradition preserve a substantial Celtic inheritance. The name Vortigern, for example, preserves a Celtic super- or wor- element meaning “over” or “great” (cognate with Latin super), and the name Cerdic is itself probably of Celtic origin.
The Celtic substratum in Slavic has been studied as recent debate, with some scholars arguing for a substantial Celtic linguistic presence in the Slavic-speaking regions. The existence of possible Celtic loanwords in Slavic, and the persistence of Celtic toponyms in the Slavic-speaking regions, suggests that the Celtic influence on the European linguistic map is more extensive than was once thought.
Related Topics
- The Celtic languages and oral tradition of which the Celtic language family is a part is examined in its broader context.
- The medieval Celtic literary tradition produced in the Celtic languages is explored through the major works of the Irish, Welsh, Scottish, and Breton traditions.
- The Ogham and other inscribed stones that preserve the earliest written evidence of the insular Celtic languages are examined as a primary source.
- The history of the Celtic civilization provides the chronological framework for the development of the Celtic languages and their spread across Europe.
- The Celtic legacy today includes the modern revival of the Celtic languages and the continuing importance of the medieval literary tradition to Celtic identity.