Elidyr the Wealthy, sometimes mistakenly called the Courteous, was supposedly the nephew of King Neithon of Strathclyde, though a brother seems more likely. He is best known for marrying the eldest legitimate daughter of King Maelgwn Hir of Gwynedd whom he considered to be this Welsh King's heiress. Mælgwn's illegitimate son, Rhun, had taken on the Gwynedd crown according to Welsh law which gave equal rights to children born on both sides of the blanket. Northern law may have looked upon things a little differently. About 560, Elidyr took a large army by sea to invade Gwynedd and press his wife's claim to the throne. He sailed through the Menai Straits to Caer-Segeint, alias Caer-yn-Arfon (Caernarfon), but Rhun was prepared for him. The latter's Welshmen defeated Elidyr's army on the Cadnant Brook and the Northern Prince was killed in the battle.

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