Hugh are you sure – perhaps history needs revisiting:
Caernarfon (/kərˈnɑːrvən/; Welsh: [kaɨrˈnarvɔn]) is a royal town, community, and port in Gwynedd, Wales, with a population of 9,615 (this figure does not include nearby Bontnewydd or Caeathro, as they are in separate communities). It lies along the A487 road, on the eastern shore of the Menai Strait, opposite the Isle of Anglesey. The city of Bangor is 8.6 miles (13.8 km) to the north-east, while Snowdonia fringes Caernarfon to the east and south-east. Carnarvon and Caernarvon are Anglicised spellings that were superseded in 1926 and 1974, respectively.