#Brythonic__Brittanic  a southern group of Celtic languages
  supertype:  Celtic_language__Celtic  a branch of the Indo-European languages that (judging from inscriptions and place names) was spread widely over Europe in the pre-Christian era
  subtype:  Welsh  a Celtic language of Wales
  subtype:  Cornish.Brythonic__cornish  a Celtic language formerly spoken in Cornwall
  subtype:  Breton  a Celtic language of Brittany

No statement uses or specializes Brythonic; click here to add one.