Title: Dyfnwal, King of Strathclyde
Content:  Dyfnwal (died 908×915) was King of Strathclyde. Although his parentage is unknown, he was probably a member of the Cumbrian dynasty that is recorded to have ruled the Kingdom of Strathclyde immediately before him. Dyfnwal is attested by only one source, a mediaeval chronicle that places his death between the years 908 and 915.
Title: Dyfnwal, King of Strathclyde
Content:  Dyfnwal appears to have been the father of Owain ap Dyfnwal, a man who succeeded him as King of Strathclyde. Dyfnwal's descendants are recorded to have ruled the Kingdom of Strathclyde into eleventh century. The personal name Dyfnwal was commonly employed by the Cumbrian royal dynasty. This name lays behind the place name of Dundonald/Dundonald Castle, derived from the British *Din Dyfnwal. Although no Cumbrian monarch can be specifically linked to this location, any one of those named Dyfnwal could be the eponym. Another place that could have been named after any of these like-named kings is Cardonald.
Title: Dyfnwal, King of Strathclyde
Content:  Dyfnwal's parentage is uncertain. No historical source accords him a patronym. He could have been a son of Rhun ab Arthgal, the last identifiable King of Strathclyde before Dyfnwal. Rhun was a member of the long-reigning Cumbrian dynasty of Strathclyde. He is the last monarch to be named by a pedigree preserved within a collection of tenth-century Welsh genealogical material known as the Harleian genealogies. A certain son of Rhun was Eochaid, a man who seems to have possessed a stake in the Scottish kingship before falling from power in the last decades of the ninth century. It is unknown if Eochaid actually ruled the Kingdom of Strathclyde, although it is possible. If Dyfnwal was not a son of Rhun, another possibility is that he descended from Eochaid: either as a son or grandson. Alternately, Dyfnwal could have represented a more distant branch of the same dynasty. If Dyfnwal was indeed a son of Eochaid, a sister of his could have been Eochaid's apparent daughter, Land, the wife of Niall Glúndub mac Áeda attested by the twelfth-century Banshenchas.
Title: Owain ap Dyfnwal (fl. 934)
Content:  far beyond the Clyde valley.  Owain was likely a son of Dyfnwal, King of Strathclyde. Dyfnwal is specifically attested by only one source, the ninth- to twelfth-century Chronicle of the Kings of Alba, which reveals he died between 908 and 915. Dyfnwal's parentage is unknown, although he might have been a member of the British dynasty that ruled Strathclyde before him. He could have been a son or grandson of Eochaid ap Rhun. Alternately, Dyfnwal could have represented a more distant branch of the same dynasty. In any case, the names borne by Owain and his apparent descendants suggest that he was indeed a member of the royal kindred of Strathclyde.
Title: Kingdom of Strathclyde
Content:  Athelstan, the kings of Wessex did extend their power far north. Athelstan defeated the men of Strathclyde in 934 and at the battle of Brunanburh in 937. Following the battle of Brunanburh, Dyfnwal ab Owain became king of Strathclyde, perhaps reigning from c. 937 until 971. It has been supposed that he was installed as king by Máel Coluim mac Domnaill, to whom Edmund of Wessex had "let" the kingdom of Strathclyde, but again, as with earlier ideas of an appanage, this is probably to overstate the case and to follow John of Fordun's version of history more closely than the facts merit. Dyfnwal died, on pilgrimage in Rome, in 975. In this period, 
Title: Dyfnwal ab Owain
Content:  Dyfnwal ab Owain (died 975) was a tenth-century King of Strathclyde. He was a son of Owain ap Dyfnwal, King of Strathclyde, and seems to have been a member of the royal dynasty of Strathclyde. At some point in the ninth- or tenth century, the Kingdom of Strathclyde expanded substantially southwards. As a result of this extension far beyond the valley of the River Clyde, the realm became known as the Kingdom of Cumbria. By 927, the kingdom seems to have reached as far south as the River Eamont. Dyfnwal appears to have reigned between the 930s and the 970s. He is first attested in the 940s, when he is recorded associated 
Title: Owain ap Dyfnwal (died 1015)
Content:  Owain ap Dyfnwal (died 1015) may have been an eleventh-century ruler of the Kingdom of Strathclyde. He seems to have been a son of Dyfnwal ab Owain, King of Strathclyde, and may well have succeeded Dyfnwal's son, Máel Coluim, King of Strathclyde. During Owain's reign, he would have faced a massive invasion by Æthelræd II, King of the English. Owain's death is recorded in 1015, and seems to have been succeeded by Owain Foel, a man who may have been his nephew.
Title: Owain ap Dyfnwal (fl. 934)
Content:  Owain ap Dyfnwal (fl. 934) was an early tenth-century King of Strathclyde. He was probably a son of Dyfnwal, King of Strathclyde, who may have been related to previous rulers of the Kingdom of Strathclyde. Originally centred in the valley of the River Clyde, this realm appears to have undergone considerable southward expansion in the ninth or tenth century, after which it increasing came to be known as the Kingdom of Cumbria. Owain may have represented the Cumbrians in the tripartite alliance with the kingdoms of Alba and Mercia, assembled by Æthelflæd, Lady of the Mercians in the second decade of the tenth century. Around this time, the Cumbrians are recorded 
Title: Dyfnwal ab Owain
Content:  The names of the latter and of his apparent descendants suggest that they were indeed members of the royal kindred of Strathclyde. Sons of Dyfnwal seem to include Rhydderch, Máel Coluim, and Owain. The name of Dyfnwal's son Máel Coluim is Gaelic, and may be evidence of a marriage alliance between his family and the neighbouring royal Alpínid dynasty of the Scottish Kingdom of Alba. Dyfnwal's father is attested in 934. Although Dyfnwal's father may well be identical to the Cumbrian monarch recorded to have fought at the Battle of Brunanburh in 937, the sources that note this king fail to identify him by name. Dyfnwal's own reign, therefore, may have stretched from about the 930s to the 970s.
Title: Eochaid (son of Rhun)
Content:  magnates who afterwards sent for him.  Certainly, nothing is recorded concerning the kingship of Strathclyde until the turn of the tenth century, when the Chronicle of the Kings of Alba notes the passing of a certain Dyfnwal, King of Strathclyde. Dyfnwal's parentage is uncertain. On one hand, he could have been another son of Rhun. On the other hand, he could have been descended from Eochaid: either as a son or grandson. Alternately, Dyfnwal could have represented a more distant branch of the same dynasty. Eochaid may have also had a daughter, Lann, the wife of Niall Glúndub attested by the Great Book of Lecan version of the twelfth-century Banshenchas. As such, if the Banshenchas is to be believed, a maternal grandson of Eochaid was Lann's son, Muirchertach mac Néill.

Question: Who is the father of Dyfnwal, King of Strathclyde?
Answer: Eochaid, son of Rhun.
Eochaid ap Rhun.
Eochaid map Rhun.
Eochaid mac Run.
Eochaid of Scotland, King of Scotland.