After the collapse of Roman authority in Britain, north Wales was invaded and colonized by Gaelic tribes from Ireland. The kingdom of Gwynedd began with the reconquest of the coast by northern Britons under the command of Maelgwn's great-grandfather Cunedda Wledig. Generations later, Maelgwn's father Cadwallon Long-Hand completed the process by destroying the last Irish settlements on Anglesey. Maelgwn was the first king to enjoy the fruits of his family's conquest and he is considered the founder of the medieval kingdom's royal family. He is thus most commonly referenced by appending the name of the kingdom to his own: Maelgwn Gwynedd.