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In page Gruffudd ap Llywelyn:

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Following Gruffudd's death, Harold married his widow Ealdgyth, who was to be widowed again three years later. Gruffudd's realm was divided again into the traditional kingdoms. Gruffudd's half-brothers, Bleddyn ap Cynfyn and his brother Rhiwallon, came to an agreement with Harold and were given the rule of Gwynedd and Powys. Thus when Harold was defeated and killed at the Battle of Hastings in 1066, the Normans reaching the borders of Wales were confronted by the traditional kingdoms rather than a single king. Gruffudd left two sons who in 1069 challenged Bleddyn and Rhiwallon at the Battle of Mechain in an attempt to win back part of their father's kingdom. However, they were defeated, one being killed and the other dying of exposure after the battle.[citation needed]