When did owain glyndwr die?

Nothing is known of Owain after 1412. Despite enormous rewards offered he was never captured. Tradition has that he either died and was buried at his estate in Sycharth or on the estates of his daughters' husbands --- Kentchurch in Herefordshire or Monnington. His son refused a pardon until 1421 when he finally accepted it. This is believed to be because his father Owain was still alive and living out his life under an assumed identity. However, there are no real records to confirm either. Historians usually aim for the 1412 period because of his lack of appearance