Dwywan is the Noah of the British islands. He and his wife Dwywach are the progenitors of the newborn human race. The sea, Llyon, broke from its bounds and flooded the world. The two, Dwywan and his wife, saved themselves in a sailless, but well-constructed vessel, made by God himself, and took on board a male and a female of every kind of animal. The ship drifted to Britain, from which country the whole world was again peopled.