1. TRAHAERN¹ OF ARWYSTLI, PRINCE OF NORTH WALES was born between 970 and 1067, and died in 1081^[1]. ^{[1, 2, 5]}
A marriage to Nesta is very doubtful. It is probable that Llywarch was the son of another woman.^[1]
Child:

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LLYWARCH AP2 TRAHAERN, b. about 1050; d. about 1130; m. DYDDGU OF BUILTH of Builth.

2. LLYWARCH AP² TRAHAERN (Trahaern of ARWYSTLI¹), son of (1) Trahaern¹, Prince of North Wales, was born between 1008 and 1082, and died between 1119 and 1139. He married DYDDGU OF BUILTH of Builth. ^{[3, 5]}
Child:

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3

i.

GLADYS3 _____, b. about 1120; d. about 1190; m. (WJ-3) PRINCE OWAIN I GWINEDH of North Wales, Wales, United Kingdom, d. in 1170, son of (WJ-2) Griffith, Prince of North Wales and (PG-2) Angharat (of TEGAINGL).

3. GLADYS³ _____ (Llywarch ap TRAHAERN², Trahaern of ARWYSTLI¹), daughter of (2) Llywarch ap² and Dyddgu (of BUILTH) TRAHAERN, was born between 1089/90 and 1131, and died between 1145 and 1241. She married (WJ-3) PRINCE OWAIN I GWINEDH of North Wales, son of (WJ-2) Griffith, Prince of North Wales and (PG-2) Angharat (of TEGAINGL), who died in 1170. ^[4]
Child: See (WJ-3) Prince Owain I GWINEDH