Owain Glyndŵr were leaving their studies to join Owain, and Welsh labourers and craftsmen were abandoning their employers in England and returning to Wales. Owain could also draw on Welsh troops seasoned by the English campaigns in France and Scotland. Hundreds of Welsh archers and experienced men-at-arms left English service to join the rebellion. In 1404, Owain held court at Harlech and appointed Gruffydd Young as his Chancellor. Soon afterwards, he called his first Parliament (or or "gathering") of all Wales at Machynlleth, where he was crowned Prince of Wales and announced his national programme. He declared his vision of an independent
Owain Gwynedd Henry did not invade Gwynedd again and Owain was able to regain his eastern conquests, recapturing Rhuddlan castle in 1167 after a siege of three months. The last years of Owain's life were spent in disputes with the Archbishop of Canterbury, Thomas Becket, over the appointment of a new Bishop of Bangor. When the see became vacant Owain had his nominee, Arthur of Bardsey, elected. The archbishop refused to accept this, so Owain had Arthur consecrated in Ireland. The dispute continued, and the see remained officially vacant until well after Owain's death. He was also put under pressure by the