in the year 830, but it is unknown how this affected Merfyn's rule. Merfyn is mentioned as a king of the Britons in a copyist's addition to the Historia Brittonum and in the Bamberg Cryptogram, but as both sources are traced to people working in Merfyn's own court during his reign, it should not be considered more significant than someone's respectful reference to his patron while working in his service. In the literary sources, Merfyn's name appears in the Dialogue between Myrddin and his sister Gwenddydd (), found in the mid-13th-century manuscript known as the Red Book of Hergest. The dialogue is a prophecy of the future kings, and lists among them Merfyn in the passage "meruin vrych o dir manaw" (). Children Rhodri the Great Gwriad Anarawd ap Merfyn See also List of rulers of Gwynedd Kings of Wales family trees Notes References Sources Further reading 844 deaths Monarchs of Gwynedd Year of birth unknown 9th-century Welsh monarchs