The Welsh Braveheart Owain Glyndwr, The Last Prince of Wales

Like William Wallace in Scotland, Owain Glyndwr fought for his country and was only finally defeated by superior numbers and the military genius of Henry V. Yet Glyndwr was not just a freedom fighter. He was the last native-born Prince of Wales, a man who initiated the first Welsh parliament at Machynlleth and proposed an entirely independent Welsh church.
Glyndwr also laid plans for two Welsh universities, proposed a return to the far sighted and revolutionary Laws of Hywel Dda and formed a Tripartite Agreement with Henry Percy and Edmund Mortimer. It led to an invasion of England and nearly brought the reign of Henry V to an end.
And yet, despite his success and popularity, Glyndwr's rebellion seriously damaged the Welsh economy with towns destroyed and much agricultural land laid to waste. Even so, he was never betrayed by his people, despite a huge reward being offered for his capture.
Glyndwr refused at least two offers of pardon from the English crown and remains the supreme champion of the underdog.