| Notes |
- Merfyn Frych seized control of Gwynedd in 825 on the death of Hywel ap Rhodri Molwynog, though he may have held power in Anglesey since 818. Merfyn was not a member of the traditional dynasty of Gwynedd, the direct male line of Maelgwn Gwynedd, and his succession marked the start of a new dynasty. His claim was apparently based on the fact that his mother, Esyllt, was the daughter of Cynan Dindaethwy ap Rhodri and the niece of Hywel ap Rhodri. According to bardic tradition, Merfyn came "from the land of Manaw", but it is uncertain whether this refers to the Isle of Man ("Ynys Manaw" in Welsh) or to Manaw Gododdin, the area around the Firth of Forth. It would seem likely that it was the latter on account of the probability he would be a blood relative of Cunedda, the founder of the Gwynedd dynasty, who was a prince of Manaw Gododdin. On the other hand there is an inscription "Crux Guriat" on a cross in the Isle of Man. This cross has been dated to the eighth or ninth century and might possibly refer to Merfyn's father.
Merfyn allied himself to the royal house of Powys by marrying Nest, daughter of Cadell ap Brochwel and sister of Cyngen king of Powys. [Actually, according to The History of The Princes, The Lords Marcher, and the Ancient Nobility of Powys Fadog, Nest verch Cadell is Merfyn's mother, not his wife.] He had a reputation as a patron of scholars; for example the Historia Britonum attributed to Nennius is thought to have been written in Gwynedd during his reign, possibly by request of Merfyn himself. A manuscript found at Bamberg gives a further insight into Merfyn's scholarly interests. Irish visitors to his court were given a cryptogram which could only be solved by transposing the letters from Latin into Greek.
Despite Danish raids, Merfyn was able to maintain his position and on his death in 844 to hand the Kingdom over intact to his son Rhodri the Great. He is said to have died in battle, but the circumstances are not recorded. His descendants came to rule not only Gwynedd but also Powys and Deheubarth and played a major role in Welsh politics until the end of Welsh independence in 1283.
Powys was united with Gwynedd when king Merfyn Frych of Gwynedd married princess Nest, the sister of king Cyngen of Powys, [Actually, according to The History of The Princes, The Lords Marcher, and the Ancient Nobility of Powys Fadog, Nest verch Cadell is Merfyn's mother, not his wife.] the last representative of the Gwertherion dynasty. With the death of Cyngen in 855 Rhodri became king of Powys, having inherited Gwynedd the year before. This formed the basis of Gwynedd's continued claims of overlordship over Powys for the next 443 years.
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790 - 843 (53 years)
[1, 4, 5, 6, 9] 
