[1][2] Angharad was the daughter of Meurig, who was evidently the King of Seisyllwg in southwestern Wales.
She married Rhodri Mawr of Gwynedd, who held power over much of Wales.
[3] Her brother Gwgon succeeded their father to the throne of Seisyllwg, but he drowned without an heir in 872.
Rhodri had no standing to take the kingship himself, but the family connection allowed him to install his second son, Cadell, as king.
Their third son, Merfyn, is sometimes said to have been installed as King of Powys.