sentences:  It appears in "" ("In Praise of Cadwallon"), a poem written by Cadwallon ap Cadfan's bard Afan Ferddig c. 633, and probably came into use a self-description before the seventh century.Historically the word applies to both the Welsh and the Brythonic-speaking peoples of northern England and southern Scotland, the peoples of the Hen Ogledd, and emphasises a perception that the Welsh and the "Men of the North" were one people, exclusive of all others.Universal acceptance of the term as the preferred written one came slowly in Wales, eventually supplanting the earlier "Brython" or "Brittones".