It was this claim to this ancient Brittonic lineage by a British monarch that led to a widepread feeling of the fulfilment of the myth of the Mab Darogan, a messianic figure of Welsh legend destined to reclaim Britain for the Celtic inhabitants.
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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.