The nation of Anglesey and Man is within the union of Britannia, and is a dominion of the British Union. The nation was formed in the aftermath of the Yellowstone Eruption of 1936, following the collapse of the United Kingdom and the eventual evacuation of the British Isles. The nation was officially formed through a union between the Isle of Man to the north and the Welsh Isle of Anglesey, known natively as Ynys Môn.