Pen Rhionydd is named as the location of King Arthur's northern court in a Welsh triad found in Peniarth MS 54, containing pre-Galfridian traditions:
Arthur as Chief Prince in Pen Rhionydd in the North, and Gerthmwl Wledig as Chief Elder, and Cyndeyrn Garthwys as Chief Bishop.[1]
There are no other known references to this location in Arthurian literature. The same triad goes on to say Arthur's other courts were at Celliwig and Mynyw.
- ^ Rachel Bromwich (editor and translator), Trioedd Ynys Prydein: The Welsh Triads, second edition (Cardiff: University of Wales, 1978), Triad 1.