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Celticisation, or Celticization, was historically the process of conquering and assimilating by the ancient Celts. Today, as the Celtic inhabited-areas significantly differ, the term still refers to making something Celtic, usually focusing around the Celtic nations and their languages.
During the 1st millennium BC, the early Celts expanded from a core territory in Atlantic Europe to Iberia, the British Isles and later also the Balkans and central Europe, and are assumed to have "Celticized" (Pre-Celtic) earlier populations such as Illyrians and Thracians in the Balkans and Basques elsewhere.
The Celticization in Pannonia began as early as the 4th century BCE.La Tene type finds are characteristic in Pre-Roman Pannonia and are considered a marker to variations in the degree of Celticization. Among the Illyrian tribes some were Celticized to varying degrees (some completely) like the Pannoni and the Dalmatae. A type of wooden oblong shield with an iron boss was introduced to Illyria from the Celts. Illyrian chiefs and kings wore bronze torcs around their necks much as the Celts did.
The Celts had two settlements that later became cities in Illyria, namely Navissos and Segestica. In Thrace they had Serdica (modern Sofia, Bulgaria), Tylis, founded by Gauls, Dunonia, Singidunum and Taurunum.
The gradual Celticization of all of Pannonia took place in the 3rd century BCE. Names became Celtic, as seen in Roman times, and Celts had established control north of the Sava and south and west of the Danube. In the western half and west of Pannonia the Pre-Celtic language disappeared. By the first half of the 1st century BCE the language of the Illyrians in Northern Dalmatia was completely Celticized. There is an abundance of Celtic names in Illyria sometimes making the Illyrian ones seem few. Those parts of Pannonia that had not been conquered by the first Celtic invasion were already Celticized by the beginning of the 3rd century BCE. The Dalmatae had been Celticized by the 3rd century BCE. In the region of Pannonia as a Roman province Celticization had almost completely eradicated Illyrian culture.
In the Alpine region as a whole, there is evidence that the non-Celtic elements had, by the time of Augustus, been assimilated by the influx of Celtic tribes and had adopted Celtic speech. According to Livy, the "sound" of the Raeti's original tongue (sonum linguae) had become corrupted as a result of inhabiting the Alps. This may indicate that at least some of the tribes lost their ancestral Raetic tongue to Celtic. Celticisation also finds support in the Roman practice of twinning the Raeti with their neighbours to the North, the Vindelici, who are regarded by most historians to have been Celtic- speakers.
By the 4th century BCE the Veneti had been so Celticized that Polybius wrote that the Veneti of the 2nd century BCE were identical to the Celts except for language. The Greek historian Strabo (64 BCE-24 CE), on the other hand, conjectured that the Adriatic Veneti were descendant from Celts who in turn were related to later Celtic tribe of the same name who lived on the Belgian coast and fought against Julius Caesar.
In the modern era, there are attempts made to reverse the effects of centuries of Anglicisation and other assimilations and re-introduce Celtic languages. Most particularly in Wales, Welsh language has seen a halt in its decline and even signs of revival, with approximately half a million fluent speakers. There have also been recent attempts to revive the Cornish language, and there are now several schools in Cornwall teaching in Cornish. The Breton language remains endangered as the number of its speakers continues to decline.
In Chapter one it was seen that the Celticization of North Pannonia had already began in the 4th century BC.
contact with the peoples of the Illyrian kingdom and at the Celticized tribes of the Delmatae
Resembling the northern Illyrian oval shield was one introduced into Illyria by the Celts. Apart from the iron boss, nothing was preserved from these Celtic shields. It is known though that they were oblong shaped and made of wood with an umbo in the center ...
Illyrian chiefs wore heavy bronze torques
In the place of the vanished Treres and Tilataei we find the Serdi for whom there is no evidence before the first century BC. It has for long being supposed on convincing linguistic and archeological grounds that this tribe was of Celtic origin
... of the survivors of Brenus expedition the Scordisci founded Singidunum in Yugoslavia
... Roman fleets, the Pannonian based on the upper course at Taurunum above Belgrade and the Moesian on the lower at Noviodunum.
Boii are connected with Taurunum, or Bononia
... Taurunum (present-day Zemun), where a long-settled Scordisci community buried their dead in the cemetery at Karaburma
In the fourth century their culture became so Celticized that Polybius described the second-century Veneti as practically indistinguishable ...
It is these Veneti [the Gallic tribe of the Belgae], I think, who settled the colony that is on the Adriatic (for about all the Celti that are in Italy migrated from the transalpine land, just as did the Boii and Senones), although, on account of the likeness of name, people call them Paphlagonians. I do not say so definitely, however; [mere] probability is usually sufficient in such matters. (Book IV, Chapter 4)
Concerning the Heneti there are two different accounts: Some say that the Heneti too are colonists of those Celti of like name who live on the seacoast; while others say that certain of the Heneti of Paphlagonia escaped hither with Antenor from the Trojan war, and, as testimony in this, adduce their devotion to the breeding of horses - a devotion which now, indeed, has wholly disappeared, although formerly it was prized among them, from the fact of their ancient rivalry in the matter of producing mares for mule-breeding. (Book V, Chapter 1)
At any rate, Sophocles says that [...] Antenor and his children safely escaped to Thrace with the survivors of the Heneti, and from there got across to the Adriatic Henetice, as it is called. (Book XIII, Chapter 1)