[5] It was in this period that a large body of popular prophetic verse about Y Mab Darogan began to circulate, often referring to him as "Owain".
Many of these poems are difficult to date and often appear in variant versions suggesting adaptation over a period of time within the oral poetic tradition.
Another, attributed to Y Bergam, seems to refer to Owain Lawgoch in the lines "And there is a man in France eager for battle / who will avenge his father with a whole army.
[9] Owain Glyndŵr was a prince descended from the Kings of Powys who led a revolt against English rule in Wales between 1400 and 1415.
[citation needed] In the lead-up to the Welshman Henry Tudor's seizing the throne of England by defeating and slaying Richard III at Bosworth Field in 1485, his supporters and the poets of Wales claimed him as Y Mab Darogan, a move that won the future king many supporters in Wales.
His reign over England was believed by some to be the fulfilment of the prophecy; a belief that he actively encouraged by naming his firstborn son Arthur Tudor.
Henry abolished the feudal marcher lordships which hitherto had ruled much of southern and western Wales and the medieval laws applying there.