Prince of Wales regard as having been the last native Prince. On 16 September 1400, he was proclaimed Prince of Wales by his supporters, and held parliaments at Harlech Castle and elsewhere during his revolt, which encompassed all of Wales. It was not until 1409 that his revolt in quest of Welsh independence was suppressed by Henry IV. The tradition of conferring the title "Prince of Wales" on the heir apparent of the monarch is usually considered to have begun in 1301, when King Edward I of England invested his son Edward of Caernarfon with the title at a Parliament held in Lincoln.
King of Wales only one to truly rule over all the (independent) Britons. For by this time, if not earlier, Wales was the only part of Britain remaining under Brittonic rule. According to Dr Sean Davies, “in these straitened circumstances, and with outside observers ridiculing the status of Welsh kings, ambitious native nobles adopted the novel title of prince (W. tywysog, L. princeps) in order to set them apart from their fellow ‘kings’. However, the title King of Wales was later used by at least one other Welsh ruler, Owain Gwynedd. "In his first two letters to Louis, Owain described himself as 'king