Rhodri ap Merfyn, commonly known as Rhodri Mawr, was a Welsh king whose legacy has impacted the history of Wales. Rhodri rose to power during a tumultuous era, where the fate of Welsh kingdoms was often determined by the power of their leaders.

Merfyn Frych, also known as Merfyn ap Gwriad and Merfyn Camwri, was King of Gwynedd from around 825 to 844, the first of its kings known not to have descended from the male line of King Cunedda.