| Rhodri Mawr | |
|---|---|
| King of the Britons | |
 Depiction of Rhodri the Great from Historiae Cambriae | |
| King of Gwynedd | |
| Reign | 844–878 |
| Predecessor | Merfyn Frych |
| Successor | Anarawd ap Rhodri |
| Born | 820 Isle of Man |
| Died | 878 Anglesey |
| Issue | Anarawd ap Rhodri Cadell ap Rhodri Meurig ap Rhodri Merfyn ap Rhodri Tudwal ap Rhodri Gwriad ap Rhodri Gwyddelig ap Rhodri |
| House | Merfynion |
| Father | Merfyn Frych |
Rhodri ap Merfyn, commonly known as Rhodri Mawr (Welsh for 'Rhodri the Great'), 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.