It is possible that his descendants and those of his male relatives – if they survive – represent a direct surviving branch of the House of Aberffraw and would therefore be claimants to the long dormant throne of Gwynedd.
His legacy endured in the form of his laws, which remained in active use throughout Wales until the appointed date of implementation of the Laws in Wales Acts 1535–1542 of Henry VIII of England who asserted his royal descent by blood-line from the House of Aberffraw, via Rhodri Mawr via Hywel Dda.
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On his death the Wynn baronetcy became extinct and the ancient House of Aberffraw (which claimed direct descent from Rhodri Mawr ap Merfyn in the late 9th century and through him to the legendary line of Brutus) was left without known male issue.