Owain Glyndŵr, a descendant of independent Welsh princely dynasties, led the last national Welsh revolt, claiming the title Prince of Wales in 1400 and for some years achieving considerable military, political and diplomatic success. Following the fall of Harlech Castle to Henry IV’s forces in 1409, Owain’s fate is unknown until his death, almost certainly in 1415. The winner of the 2016 Creative Non-fiction Prize in Literature Wales’s Book of the Year (Welsh Language), talks to Guto Harri about the traditions relating to Glyndŵr’s mysterious last years – traditions mostly centred on Herefordshire – and about Glyndŵr’s significance in Welsh history.