Merfyn ap Rhodri

{{Short description|9th century Aberffraw prince of Gwynedd}}

{{Use dmy dates|date=April 2022}}

{{wn|Merfyn|Rhodri}}

Merfyn ap Rhodri (died {{circa|lk=no|900}}) was a late 9th century Aberffraw prince of Gwynedd. He is sometimes credited with ruling Powys after the death of his father

Rhodri Mawr (Rhodri the Great) in 878. In the accounts where he is credited as a king, he is reported to have lost his realm to an invasion by his brother Cadell, King of Ceredigion. Merfyn's death may be connected to the incursion into Anglesey by the Viking Ingimundr in the first decade of the 10th century.

The drowning of his son Haearnddur, or "Haardur", was reported by both the Chronicle of the Princes{{langx|wlm|Oed Crist 953, y boddes Haearnddur fab Merfyn}}. Cambrian Archaeological Association. Archaeologia Cambrensis: [https://books.google.com/books?id=CZAbAQAAIAAJ&pg=RA1-PA24 Chronicle of the Princes], p. 24, W. Pickering, 1864. Accessed 19 February 2013. and the Annals of Wales.{{langx|la-x-medieval|haardur .f(ilius). meuruc mersus est}}. Annals of Wales (B text), p. 10. {{in lang|la}} The first places it in the year 953; Phillimore's reconstruction of the latter's datingHarleian MS. 3859. Op. cit. Phillimore, Egerton. Y Cymmrodor 9 (1888), pp. 141–183. {{in lang|la}} would place it in 956.