1. TRAHAERN¹ OF ARWYSTLI, PRINCE OF NORTH WALES was born between 971 and 1067, and died in 1081^[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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2

i.

LLYWARCH AP2 TRAHAERN, d. about 1129; m. DYDDGU OF BUILTH of Builth.

2. LLYWARCH AP² TRAHAERN (Trahaern of ARWYSTLI¹), son of (1) Trahaern¹, Prince of North Wales, was born between 1009 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, m. (UA-3) PRINCE OWAIN I GWINEDH of North Wales, Wales, United Kingdom, d. in 1170, son of (UA-2) Griffith, Prince of North Wales and (NL-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 1090 and 1131, and died between 1145 and 1241. She married (UA-3) PRINCE OWAIN I GWINEDH of North Wales, son of (UA-2) Griffith, Prince of North Wales and (NL-2) Angharat (of TEGAINGL), who died in 1170. ^[4]
Child: See (UA-3) Prince Owain I GWINEDH