| The Celtic languages are the languages descended | | | | There are two competing schemata of |
| from Proto-Celtic, or "Common Celtic", a branch | | | | categorization. One scheme, argued for by |
| of the greater Indo-European language family. | | | | Schmidt (1988) among others, links Gaulish with |
| During the 1st millennium BC, they were spoken | | | | Brythonic in a P-Celtic node, leaving Goidelic as |
| across Europe, from the Bay of Biscay and the | | | | Q-Celtic. The difference between P and Q |
| North Sea, up the Rhine and down the Danube to | | | | languages is the treatment of Proto-Celtic *kw, |
| the Black Sea and the Upper Balkan Peninsula, and | | | | which became *p in the P-Celtic languages but *k |
| into Asia Minor (Galatia). Today, Celtic languages | | | | in Goidelic. An example is the Proto-Celtic verb |
| are now limited to a few areas in the British Isles, | | | | root *kwrin- "to buy", which became pryn- in |
| eastern Canada, Patagonia, scattered groups in | | | | Welsh but cren- in Old Irish. |
| the United States and Australia, and on the | | | | The other scheme, defended for example by |
| peninsula of Brittany in France. | | | | McCone (1996), links Goidelic and Brythonic |
| Proto-Celtic apparently divided into four | | | | together as an Insular Celtic branch, while Gaulish |
| sub-families: | | | | and Celtiberian are referred to as Continental |
| Gaulish and its close relatives, Lepontic, Noric and | | | | Celtic. According to this theory, the "P-Celtic" |
| Galatian. These languages were once spoken in a | | | | sound change of [k?] to [p] occurred |
| wide arc from France to Turkey and from | | | | independently or areally. The proponents of the |
| Belgium to northern Italy. | | | | Insular Celtic hypothesis point to other shared |
| Celtiberian, anciently spoken in the Iberian | | | | innovations among Insular Celtic languages, |
| peninsula, namely in the areas of modern Portugal, | | | | including inflected prepositions, VSO word order, |
| Galicia, Asturias, Cantabria, Arag'n and Le'n. | | | | and the lenition of intervocalic [m] to [z], a |
| Goidelic, including Irish, Scots Gaelic, and Manx. | | | | nasalized voiced bilabial fricative (an extremely |
| Brythonic (also called Brittonic), including Welsh, | | | | rare sound). There is, however, no assumption |
| Breton, Cornish, Cumbric, the hypothetical Ivernic, | | | | that the Continental Celtic languages descend |
| and possibly also Pictish. | | | | from a common "Proto-Continental Celtic" |
| Scholarly handling of the Celtic languages has been | | | | ancestor. Rather, the Insular/Continental schemata |
| rather argumentative owing to lack of primary | | | | usually considers Celtiberian the first branch to |
| source data. Some scholars distinguish Continental | | | | split from Proto-Celtic, and the remaining group |
| and Insular Celtic, arguing that the differences | | | | would later have split into Gaulish and Insular Celtic. |
| between the Goidelic and Brythonic languages | | | | There are legitimate scholarly arguments in favour |
| arose after these split off from the Continental | | | | of both the Insular Celtic hypothesis and the |
| Celtic languages. Other scholars distinguish P-Celtic | | | | P-Celtic/Q-Celtic hypothesis. Proponents of each |
| from Q-Celtic, putting most of the Continental | | | | schema dispute the accuracy and usefulness of |
| Celtic languages in the former group (except for | | | | the other's categories. Since the realization that |
| Celtiberian, which is Q-Celtic). | | | | Celtiberian was Q-Celtic in the 1970s, the division |
| The Breton language is Brythonic, not Gaulish. | | | | into Insular and Continental Celtic is the more |
| When the Anglo-Saxons moved into Great Britain, | | | | widespread opinion. |
| some of the native Brythons or "Welsh" (from a | | | | When referring only to the modern Celtic |
| Germanic word for "foreigners") fled across the | | | | languages, since no Continental Celtic language has |
| English Channel and landed in Brittany. They | | | | living descendents, "Q-Celtic" is equivalent to |
| brought their Brythonic language with them, which | | | | "Goidelic" and "P-Celtic" is equivalent to "Brythonic". |
| evolved into Breton - which is still partially intelligible | | | | Within the Indo-European family, the Celtic |
| with Modern Welsh and Cornish. | | | | languages have sometimes been placed with the |
| The distinction of Celtic into these four | | | | Italic languages in a common Italo-Celtic subfamily, |
| sub-families probably occurred about 1000 BC. | | | | a hypothesis that is now largely discarded, in |
| The early Celts are commonly associated with | | | | favour of the assumption of language contact |
| the archaeological Urnfield culture, the Hallstatt | | | | between pre-Celtic and pre-Italic communities. |
| culture, and the La Tene culture. | | | | |