Commentary
Stewart Baldwin: 'ByT, p. 101 explicitly states that Iwerydd ferch Cynfyn was Cynfyn's daughter by a mother (unnamed) different from Angharad. ABT.2f,7k states that Angharad was Iweydd's mother. Since it is a common mistake to assume that all of a man's children are by his known wife, it is more likely that ByT is correct here.'
Family
ClaimDetailEvidence
FatherCynfyn ap Gwerstan, King of Powys (e988-) [S934] [S2730]
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SpouseEdwin King of Tegeingl (e1030-) 
Child +Owain ap Edwin of Deheubarth (e1053-1104) [S934] [S2730]
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Attributes
ClaimDetailEvidence
GenderFemale
NameIwerydd ferch Cynfyn [S2730]
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NameIweryd [S934]
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FatherCynfyn ap Gwerstan, King of Powys (e988-) [S934] [S2730]
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Timeline
ClaimDateDetailAgeEvidence
Birthaft 1030Wales [S934]
she was born to his 2nd wife, his first wife having 2 children, the first born about 1025
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Sources
IndexTitle
[S934] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Wales)" (2006-7 (v1.1 Updated 12 April 2007)) (https://fmg.ac/Projects/MedLands/WALES.htm).
[S2730] Baldwin, Stewart, "Medieval Genealogy Newsgroup: Llywelyn ap Iorwerth Ancestor Table" (http://sites.rootsweb.com/~medieval/llywelyn.htm).