Geoffrey of Monmouth needed a capital for King Arthur. In his Historia Regum Britanniae, finished around 1136, he chose Caerleon - and he chose it carefully. "For it was located in a delightful spot in Glamorgan, on the River Usk, not far from the Severn Sea. Abounding in wealth more than other cities, it was suited for such a ceremony." Geoffrey had walked the place. He could see what was left of the Roman fortress, still rising in great blocks where stone hadn't yet been carried off for medieval castles. He needed his Arthur to have somewhere worthy. Seven centuries later, Alfred Tennyson would lodge at The Hanbury Arms here while writing his Morte d'Arthur, the poem that became Idylls of the King. Caerleon has had two acts: Roman garrison town for 200 years, and Arthurian touchstone for the millennium that followed.
The hill above the modern town - Lodge Wood Camp - holds the largest fortified Iron Age enclosure in South Wales, defended by three lines of massive ramparts and ditches. The Silures, the Iron Age tribe of South Wales, had been here from at least the 5th century BC, importing La Tène-style goods through what was already a sophisticated trading network. Excavation in 2000 showed that Lodge Wood Camp was continuously occupied from its founding until the Romans built Isca Augusta around AD 78. There is no evidence the hillfort was taken militarily. The abandonment may have been negotiated - part of the terms of peace between Silures and Rome. After the Roman occupation, the hillfort was reoccupied and stayed in use after the legions left, suggesting whatever pre-Roman society existed had survived underneath. The story of Caerleon is layered: Iron Age first, then Rome on top, then medieval Welsh kingdom, then English Norman castle.
Isca Augusta was the headquarters of Legio II Augusta from roughly AD 75 to AD 300 - just over two centuries of permanent occupation. The amphitheatre, the bath house, the barracks at Prysg Field, the fortress walls all survive in part. In August 2011 archaeologists discovered the remains of a Roman harbour on the Usk, only the second one known from Britain after London's. According to Gildas, followed by Bede, Roman Caerleon was the site of two early Christian martyrdoms - those of Julius and Aaron - and recent finds suggest some kind of Roman occupation as late as AD 380. "Caer" in Welsh signifies a fortress or stronghold. "Caerleon" is, literally, the fortress of the legion. The Welsh name remembered what the Romans had been, long after the Romans themselves had become something written in books.
After Rome, Caerleon became one of the earliest centres of Christianity in Britain. It was an early Metropolitan See, associated with Saint Dubricius - commonly depicted holding two crosiers, one for Caerleon and one for Llandaff. At the Synod of Brefi around 545 AD, Dubricius is said to have voluntarily given the See of Caerleon to Saint David, who would later move the seat to Mynyw (today's St David's in Pembrokeshire). The Synod of Victory, officiated by Saint David around 569 AD, also took place here. Another medieval saint, Cadoc, is associated with the parish church built directly over the principia - the legionary headquarters - and Saint Cadoc's Church may have been the site of a 6th-century monastic cell. Welsh mythology and Medieval Welsh literature return again and again to Caerleon as a model city against which others are compared. The Triads of the Island of Britain call it "superior to all the towns and fortifications in Cambria."
After the Norman Conquest, a motte-and-bailey castle was built outside the eastern corner of the Roman fort, possibly by the Welsh Lord Caradog ap Gruffydd. The Domesday Book of 1086 records the manor as held by Turstin FitzRolf, William the Conqueror's standard-bearer at Hastings - alongside three Welshmen with their own ploughs, recorded as continuing their Welsh customs. After Turstin's apparent banishment in 1088, the lands passed to Wynebald de Ballon. By 1155, Henry II had recognised the Welsh Lord Morgan ab Owain, and Caerleon remained in Welsh hands through cycles of skirmishing with the Normans. In 1171, Iorwerth ab Owain and his two sons destroyed the town and burned the castle. William Marshal seized both castle and borough in 1217 and rebuilt the castle in stone. During the Glyndŵr Rising in 1402, Rhys Gethin took Caerleon castle by force - the last time it was ruined. The walls still stood in 1537, but the castle ruins finally collapsed in 1739. The most visible remnant is the Round Tower at the Hanbury Arms pub, now Grade II* listed.
By the mid 19th century Caerleon was no longer a port - Newport had taken that trade with its deepwater docks downstream - but it had become an Arthurian pilgrimage site. Alfred Tennyson stayed at the Hanbury Arms while he wrote what would become Idylls of the King, the great Victorian retelling of the Arthurian legends. The writer Arthur Machen was born here in 1863 and used Caerleon repeatedly as a setting for his strange, haunted fiction. Today there is a stainless steel statue of a knight near the square, made by the Belgian sculptor Thierry Lauwers - The Hanbury Knight, a modern echo of Tennyson's poem and Geoffrey of Monmouth's ceremony. Goldcroft Common, the last of seven medieval commons, still holds the centre of the town. Around it cluster Saint Cadoc's Church, the National Roman Legion Museum, the Roman Baths Museum, the Mynde, the Priory Hotel, and 86 other listed buildings - more layered history per square mile than almost anywhere else in Wales.
Today Caerleon is a community within Newport, three and a half miles from the city centre, just north of the M4 motorway. The Caerleon railway station closed long ago but is one of the candidates being considered for the South Wales Metro project. The Newport Half Marathon route passes through the village past the amphitheatre. The Velothon Wales cycle race included Caerleon on a 140 km route in 2018, with Geraint Thomas himself riding past his own birthplace. The Tour of Britain came through in 2017 and 2018. Belmont Hill, just outside the village, is a Category 2 climb with an average gradient of 9 percent - steep enough that Geraint Thomas, fresh off winning the Tour de France in 2018, was reported to have called it "too steep" before losing the lead position. Nineteen centuries after the legion arrived, Caerleon is still a destination people exhaust themselves trying to reach.
Caerleon sits at 51.6111°N, 2.9531°W on the west bank of the River Usk, about 5 miles north-east of Newport city centre and 5.5 miles south-east of Cwmbran. From the air, the distinctive oval of the Roman amphitheatre is visible on the southern edge of the village, just inside the line of the former fortress walls. Lodge Wood Camp Iron Age hillfort rises sharply on the north-western side. Nearest airport is Cardiff (EGFF), 15 miles to the south-west; Bristol (EGGD) lies 25 miles east across the Severn Estuary. The M4 motorway runs 2 miles south of the village. Best viewed at lower altitudes where the amphitheatre, the National Roman Legion Museum, Saint Cadoc's Church, and the Round Tower at the Hanbury Arms can all be picked out, framed by the bend of the Usk to the south.