There is some evidence to suggest, in the poetry of the Welsh Bard Llawdden for example, that a few diehards continued to fight on even after 1421 under the leadership of Owain's son-in-law Phylib ap Rhys.
I den walisiske Bard Llawddens poesi er der tegn på, at nogle få helhjertede fortsatte med at kæmpe efter 1421 under lederskab af Owains svigersøn Phylib ap Rhys.