Rhodri the Great (in Welsh, Rhodri ap Mawr or Rhodri ap Merfyn; occasionally in English, Roderick the Great) (c. 820 – 878) is King of Gwynedd from 844 until his death.
He is the first Welsh ruler to be called 'Great', and the first to rule most of present-day Wales.
He is referred to as "King of the Britons" by the Annals of Ulster.
In some later histories, he is referred to as "King of Wales" but he did not rule all of Wales nor was this term used contemporaneously to describe him.
