Commentary
Weis says it is doubtful that Trahaern ap Caradog married Nesta of North Wales (dau. of Gruffydd ap Llywelyn and Edith of Mercia). Instead he supposes that Llywarch ap Trahaern is the son of another woman.

Stewart Baldwin concerning Llywarch's wife: ' Bartrum p. 354 gives Dyddgu ferch Iorwerth ap Cadwgan ab Elystan Glodrudd in this position, but his only source is the late visitation LD.ii.24, which names Dyddgu as the mother of another child of Llywarch, but not of Gwladus. In addition, the sources given by Bartrum for Dyddgu's alleged father Iorwerth ap Cadwgan are all late 16th century or later, so Iorwerth's existence is also uncertain. In my opinion, this link should be regarded as dubious.'
Family
ClaimDetailEvidence
FatherTrahaern ap Caradog, King of Gwynedd (e1041-1081) [S756] [S2730]
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Child +Gwladus ferch Llywarch (e1101-) [S756] [S934] [S2730]
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Attributes
ClaimDetailEvidence
GenderMale
NameLlywarch ap Trahawarn [S756]
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NameLlywarch ap Trahearn ap Caradog [S934]
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NameLlywarch ap Trahaern [S2730]
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FatherTrahaern ap Caradog, King of Gwynedd (e1041-1081) [S756] [S2730]
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Timeline
ClaimDateDetailAgeEvidence
Birthest 1068 (1057-1080)
 
Flourishing 1109 to 1124 [S2730]
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Deathabt 1129 [S756]
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Sources
IndexTitle
[S756] Weis, Frederick Lewis, "Ancestral Roots of Sixty Colonists Who Came To New England before 1700, 7th Ed." (Genealogical Publishing Co., Inc., Baltimore, 1999).
[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).