Celticisation, or Celticization, was historically the process of conquering and assimilating by the ancient Celts, or via cultural exchange driven by proximity and trade.
[16] Names became Celtic,[16] as seen in Roman times, and Celts had established control[16] north of the Sava and south and west of the Danube.
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.
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.
[23] 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, the Welsh language has seen a halt in its decline and even signs of revival, with approximately half a million fluent speakers.