Cumbric

Cumbric is an extinct Celtic Brythonic language or dialect that was spoken during the Early Middle Ages in the Hen Ogledd or "Old North", in what is now Northern England and the southern Scottish Lowlands. Place-name evidence suggests Cumbric may also have been spoken as far south as Pendle and the Yorkshire Dales. The prevailing view is that it became extinct in the 12th century, around the incorporation of the Kingdom of Strathclyde into the Kingdom of Scotland.

Linguists are undecided as to whether to classify Cumbric as a dialect of Old Welsh or as a separate language. Koch calls it a dialect but goes on to say that some of the place names in the Cumbric region "clearly reflect a developed medieval language, much like Welsh, Cornish or Breton".