The
battle of Arthuret, or Arderydd (Arthur's Head, interestingly) involved Rhydderch
of Strathclyde and Genddolau, and contains the first real mention of Merlin
in any literature. This battle also makes mention of the famous Urien and Owain
of Rheged, and occurred sometime in the ??? century, outside of the generally
acknowledged Arthurian time-frame. Urien and Owain of Rheged are often picked
up as part of the Arthurian legend.