either in Wales or eastern England. Family background and marriage Merfyn was linked to the earlier dynasty through his mother Esyllt, the daughter of King Cynan (d. after 816), rather than through his father Gwriad ap Elidyr. As his father's origins are obscure, so is the basis of his claim to the throne. Extremely little is known of Merfyn's father Gwriad. Merfyn claimed descent from Llywarch Hen through him, and the royal pedigree in Jesus College MS. 20 says that Gwriad was the son of Elidyr, who bears the same name as his ancestor, the father of Llywarch Hen, Elidyr lydanwyn. Supporting the veracity of the pedigree is an entry in the Annales Cambriae, which states that Gwriad, the brother of Rhodri the Great, was slain on Anglesey by the Saxons. That is to say, Merfyn named one of his sons after his father Gwriad. The discovery of a cross inscribed Crux Guriat () on the Isle of Man and dated to the 8th or 9th century raised the question of whether Gwriad's possible connection to "Manaw" was to Manaw Gododdin, once active in North Britain, or to the Isle of Man (). John Rhys suggested that Gwriad might well have taken refuge on the Isle of Man during the bloody dynastic struggle between Cynan and Hywel prior to Merfyn's accession to the throne, and that the cross perhaps does refer to the refugee Gwriad, father of Merfyn. He goes on to note that the Welsh Triads mention a 'Gwryat son of Gwryan in the North'. Other locations for "Manaw" have been suggested, including Ireland, Galloway and Powys. While Rhys's suggestion is not implausible, his reference to Gwriad's father Gwrian contradicts the royal pedigree, which says that Gwriad's father was Elidir, so this may be a confusion of two different people named Gwriad. Gwriad's name does appear with northern origins in the Welsh Triads as one of the "Three kings, who were of the sons of strangers" (sometimes referred to as the "Three Peasant Kings"), where he is identified as the son of "Gwrian in the North". Merfyn allied his own royal family with that of Powys by marrying Nest, daughter or sister of King Cadell ap Brochfael, of the Royal House of Gwertherion. Reign Precious little is known of Merfyn's reign. Thornton suggests that Merfyn was probably among the Welsh kings who were defeated by Ecgberht, king of Wessex,