House of Mathrafal
The Royal House of Mathrafal began as a cadet branch of the Welsh Royal House of Dinefwr, taking their name from Mathrafal Castle. They effectively replaced the House of Gwertherion, who had been ruling the Kingdom of Powys since late Roman Britain, through the politically advantageous marriage of an ancestor, Merfyn the Oppressor. King Bleddyn ap Cynfyn would join the resistance of the Anglo-Saxon King Harold Godwinson, against the invasion of William the Conqueror, following the Norman conquest of England. Thereafter, they would struggle with the Plantagenets and the remaining Welsh Royal houses for the control of Wales. Although their fortunes rose and fell over the generations, they are primarily remembered as Kings of Powys and last native Prince of Wales.