Dyfnwal 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... Wikipedia
Great grandchildren: Máel Coluim, King of Strathclyde, Rhydderch ap Dyfnwal, and Owain ap Dyfnwal
Grandchild: Dyfnwal ab Owain
Parents: Eochaid ab Rhun and Rhun ab Arthgal
Children: Owain ap Dyfnwal