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Caernarfon Castle Caernarfon is architecturally one of the most impressive of all of the castles in Wales. It's defensive capabilities were not as overt or as powerful as those of Edward I's other castles such as Harlech and Beaumaris (which indicate the pinnacle of castle building and defenses in Britain), but Caernarfon was instead intended as a seat of power - and as a symbol of English dominance over the subdued Welsh. Caernarfon is located at the southern end of the Menai Strait between north Wales and Anglesey, 8 miles south west of Bangor. During Edward I's invasions of Wales, this was strategically an excellent place to build a castle; Anglesey was referred to as the garden of Wales, providing agriculturally rich land close to the poorer land on north Wales. The Menai Strait also allowed speedy access between the north Welsh coast and the western coast, and was therefore important for Edward to control for supplying outposts such as Harlech and Aberystwyth.
As with all of the castles of Edward's Iron Ring, Caernarfon was built on the shoreline (as alluded to above, supplies came by sea due to the Welsh prowess in convoy ambush over land - see Welsh Warriors and Warfare page). At Caernarfon, Edward also built a town, destroying the original Welsh settlement beforehand. Therefore the entirety of the new settlement was of English origin, and the Welsh "Caernarfon" was anglicised "Caernarvon". 
The castle of Edward I at Caernarfon succeeded first a Roman fort, and then a Norman motte and bailey - built by Hugh of Avranches around 1090. This motte was incorporated into the Edwardian castle, but was destroyed around 1870 (Dr Lawrence Butler suggested to me that there is a good argument for a new resistivity survey to be carried out for the investigation of this). The Welsh retook the original motte in 1115 and retained control until Edward's invasion and colonization in 1283. The site's previous history also demonstrates the strategic importance of the site.
Edward's building was initiated by his march from Chester, and work probably began in May 1283. Edward wanted to create a nucleus of English influence in this area, which was previously so rich in Welsh tradition and anti-English feeling. He also wished to create Caernarfon as the capital of a new dominion - hence the incorporation of a town and market into the strong walls of the site.
Material for the building of the castle, town, walls, gates, and important quay were ferried in by sea. All of the initial building took place as a single operation, started in the summer of 1283. The first recorded entry of work was on the new castle's ditch, separating the castle from fortified town; this occurred on June 24th. Next, as with most castles built in enemy territory, a wooden barricade was erected to defend the building works from attack. Timber was shipped in from Liverpool, Rhuddlan, and Conway, and labourers began to cut the moat - this also supplied the rock for the walls (which were twenty foot thick at their base). The Welsh township was also demolished at this time. The only tower of the castle completed during the first phase of building was the Eagle Tower; the main priority was to make the site defensible, before later adding the impressive architecture of dominion's new capital. Work continued swiftly and the castle and town walls were substantially completed by late 1285. The architect for this first building phase was Master James of St George - a renowned and gifted castle architect - and from 1283-92, £12,000 had been spent.
At the end of the first building phase, the north wall of the castle had no wall, and was instead defended by the town walls and a wide rock cut ditch. Madog ap Llywelyn over-ran the castle through this ditch in his revolt of 1294, and succeeded in burning part of the castle and damaging the town walls. The English retook the castle next summer, and orders were given to make the castle defendable again by 11th November 1295. The town walls and castle were repaired, and the north wall of the castle was finally added, including the King's Gate. By 1330, the building payments ceased and the castle stood with similar looks as it does today. Overall, the expenditure on Edward I's grandest castle had been £25,000 over 50 years.
The Eagle Tower (shown right), Queen's Tower, Chamberlain Tower and Black Tower all were accommodation towers built on several storeys, mostly with self contained chapels on each storey (indicative of high status accommodation). Two halls existed - the Great Hall and a hall in the King's Tower. The castle was intended to and capable of accommodating the household of the king's eldest son (created Prince of Wales under Edward I), with his council, family and guests also in attendance. As mentioned before, this was as the castle was intended as the capital of a new dominion, and a palace for the dynasty of the new Prince of Wales. In addition to the grandeur, the castle also permanently housed a constable, watchmen, and the garrison. 
Caernarfon was defended in two parts - the castle itself, and the town walls. Edward's strongest castles were concentric, providing optimal defensive capabilities, but the use of castle and town walls provided up to two lines of defence, with the benefit of an ostentatious appearance - essential when considering Caernarfon's intended purpose. However, it should not be assumed that Caernarvon was a weak castle - it's completed defences were formidable.
The castle itself had two gateways defended by strong gatehouses; it also had seven towers lining it's walls (which themselves were up to twenty feet thick). As mentioned above, the north wall was initially absent, being defended by a ditch and the town itself; the second building phase saw this wall added, completed by the King's Gate.
The King's Gate was never fully completed, but was immensely strong - it was twin towered, and had been intended to have a drawbridge, five doors, six portcullises, and a right angled turn (rendering attackers' shields useless as they turned the corner) from the main gatehouse into a smaller ward over a second drawbridge... and that doesn't even begin to consider the arrangement of murder holes, arrow loops and spy holes. The defences at the Queen's Gate were not as substantial as those at the other gateway; again, it was never fully completed. The gate was defended by twin towers, but could only be reached up the stone ramp from ground level to the summit of the earlier motte, on top of which the Queen's Gate was originally built. This made it far less vulnerable to attack, but even so, the gate was defended by two drawbridges and five murder holes. The final, and major, part of Caernarfon's defences were the town walls. This was an 800 yard circuit with eight towers and two twin towered gateways. The towers were situated 70 yards apart, the southern end of the circuit was blocked by the castle walls. The town walls were entirely surrounded by water filled moats, and the Rivers Cadnant and Seiont, and of course, the Menai Strait. The East Gate was the principal entrance - defended by a drawbridge, crenellated gateway, and two towers. The West Gate also had two towers, in addition to a barbican and portcullis; it faced out onto the Menai Strait.
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