Caernarfon Castle. Caernarfon Castle, often anglicised as Carnarvon Castle or Caernarvon Castle, is a medieval fortress in Caernarfon, Gwynedd, north-west Wales cared for by Cadw, the Welsh Government's historic environment service.
   It was a motte-and-bailey castle from the late 11th century until 1283 when King Edward I of England began to replace it with the current stone structure. The Edwardian town and castle acted as the administrative centre of north Wales, and as a result the defences were built on a grand scale.
   There was a deliberate link with Caernarfon's Roman past, and the Roman fort of Segontium is nearby. While the castle was under construction, town walls were built around Caernarfon.
   The work cost between E20,000 and E25,000 from the start until the work ended in 1330. Although the castle appears mostly complete from the outside, the interior buildings no longer survive and many of the building plans were never finished.
   The town and castle were sacked in 1294 when Madog ap Llywelyn led a rebellion against the English. Caernarfon was recaptured the following year. During the Glyndŵr Rising of 1400-1415, the castle was besieged. When the Tudor dynasty ascended to the English throne in 1485, tensions between the Welsh and English began to diminish and castles were considered less important. As a result, Caernarfon Castle was allowed to fall into a state of disrepair. Despite its d
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