Next to the legendary kingdom of Urien‘s Rheged lay another, smaller kingdom. We don’t know what it was called, but in the third quarter of the 6th century, north-west Cumbria and the Solway area were ruled by a man called Gwenddoleu.
Investigating Gwenddoleu is like looking through cracked bottle-glass windows: you see a flash here, a hint there. Sometimes you see something clearly, and sometimes you squint and turn and it’s still just a suggestion. There are several sources which mention Gwenddoleu – the Annales Cambriae; the Welsh Triads and genealogies; the Merlin poems of the Black Book of Carmarthen; the Chronica Gentis Scottorum – but the references are veiled, fleeting, and sometimes of dubious date.