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Caerphilly is a major town in south-east Wales, best known for its vast medieval castle and its historic role as a strategic stronghold, and later as a coal-mining and market centre.

Caerphilly lies at the southern end of the Rhymney Valley, about seven miles north of Cardiff and roughly nine-and-a-half miles west of Newport. It is separated from Cardiff's northern suburbs - Lisvane and Rhiwbina - by Caerphilly Mountain, a prominent ridge rising above the town.

The town sites within Caerphilly County Borough, whose neighbouring communities include Risca, Blackwood, and Bargoed. The landscape is typical of the South Wales Valleys, with steep hills, river-cut valleys, and upland terrain, with the River Rhymney forming part of the town's eastern boundary.

Archaeological evidence shows that the wider area was strategically important long before the medieval town emerged. The Romans built a fort at Caerphilly around AD 75, which remained occupied until the mid-second century. Additional Roman military sites existed nearby, including a command garrison at Old Gelligaer.

North of Risca, within the county borough, archaeologists have also identified Iron Age fortifications and a medieval castle mound, indicating long-standing settlement in the region.

The name Caerffili (fort of Ffili) reflects early traditions of a local stronghold, though the exact origin is uncertain.

Following the Norman conquest, the district of Senghenydd remained under Welsh control until the mid-12th century, when it came under the rule of Ifor Bach and later his descendants. The decisive turning point came in 1266, when Gilbert de Clare, the Marcher Lord of Glamorgan, seized the area. To secure his position against Llywelyn ap Gruffudd, Prince of Wales, he began building Caerphilly Castle in April 1268.

Although attacked and partially destroyed during the conflict, the castle was rebuilt from 1271 onward, forming the nucleus around which the town developed.

From the 18th and 19th centuries, Caerphilly became deeply tied to the coal mining industry, part of the wider South Wales Coalfield. The town also became known for Caerphilly Cheese, a crumbly white cheese created in the early 19th century for local miners. Coal mining declined sharply in the late 20th century, leading to economic restructuring. Today, the town's economy centres on light industry, retail, services, and its role as a commuter town for Cardiff. Tourism, especially heritage tourism, also contributes significantly, driven by the castle and cultural events.

Caerphilly Castle, the town's defining landmark, covers 30 acres, and is the largest castle in Wales and the second-largest in Britain after Windsor Castle. Built by Gilbert de Clare, it features concentric defences, extensive waterworks, and a famously learning tower damaged during the Civil Wars.

Caerphilly's historic town centre is a mix of Victorian and modern commercial buildings, reflecting its growth during the mining era.

Caerphilly Mountain is a scenic upland area offering views over Cardiff and the valleys.

Businesses, industries, schools, museums, libraries, historical places, art galleries, entertainment venues, organisations, sports teams, recreational programmes, and events in Caerphilly are the focus of this category.

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