Idnerth Lord of Builth
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- 1 Idnerth Lord of Builth [1]
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- 2 Dyddgy, of Builth [1.1]
- Llywarch d. 1129
- 3 Gladys, of North Wales [1.1.1]
- Gwinedh, Prince of North Wales Owain I d. 1170
- 4 Drwyndwn, Prince of North Wales Iorworth [1.1.1.1] d. 1174
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- 4 Drwyndwn, Prince of North Wales Iorworth [1.1.1.1]
- 3 Gladys, of North Wales [1.1.1]
- 2 Dyddgy, of Builth [1.1]