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
Aberystwyth Castle Cadwaladr's later attempt to murder Anarawd ap Gruffydd, the new king of Deheubarth, resulted in Owain Gwynedd sending his son Hywel ab Owain Gwynedd to burn it in 1143. The castle was rebuilt and later reinforced with stone. After a succession of at least three owners, it was taken by Welsh prince Llywelyn the Great in 1221. Llywelyn razed the castle and erected a new one in its place. The current castle was rebuilt in its current location by Edward I of England in 1277 after the end of the first war against Llywelyn ap Gruffydd Llywelyn the Great's grandson.