Pinched this off Wiki, its as I always thought:
In 1404, Owain held court at Harlech and appointed Gruffydd Young as his Chancellor. Soon afterwards, he called his first Parliament (Cynulliad 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 Welsh state with a parliament and separate Welsh church.
Will have a dig to see if I can find what Bryant is on about... now theres a plonker for you