For the Castle class locomotive of this name, see GWR 4073 Class 4073 Caerphilly Castle

GWR 4073 Class 4073 Caerphilly Castle

Caerphilly Castle is a member of the GWR 4073 Class built in 1923. Its first shed allocation was Old Oak Common. Its August 1950 shed allocation was Bath Road, Bristol. Its last shed allocation was Cardiff Canton in March 1959...

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Caerphilly Castle is a medieval castle

Castle

A castle is a type of fortified structure built in Europe and the Middle East during the Middle Ages by European nobility. Scholars debate the scope of the word castle, but usually consider it to be the private fortified residence of a lord or noble...

 that dominates the centre of the town of Caerphilly

Caerphilly

Caerphilly is a town in the county borough of Caerphilly, south Wales, located at the southern end of the Rhymney Valley, with a population of approximately 31,000. It is a commuter town of Cardiff and Newport, which are located some 7.5 miles and 12 miles away, respectively...

 in south Wales

Wales

Wales is a country that is part of the United Kingdom and the island of Great Britain, bordered by England to its east and the Atlantic Ocean and Irish Sea to its west. It has a population of three million, and a total area of 20,779 km²...

. It is the largest castle in Wales and the second largest in Britain after Windsor Castle

Windsor Castle

Windsor Castle is a medieval castle and royal residence in Windsor in the English county of Berkshire, notable for its long association with the British royal family and its architecture. The original castle was built after the Norman invasion by William the Conqueror. Since the time of Henry I it...

. Built mainly between 1268 and 1271 to stop Llywelyn ap Gruffudd

Llywelyn the Last

Llywelyn ap Gruffydd or Llywelyn Ein Llyw Olaf , sometimes rendered as Llywelyn II, was the last prince of an independent Wales before its conquest by Edward I of England....

's southward ambitions, it is an early example of a concentric castle

Concentric castle

A concentric castle is a castle with two or more concentric curtain walls, such that the outer wall is lower than the inner and can be defended from it. The word concentric does not imply that these castles were circular; in fact if taken too literally the term "concentric" is quite misleading...

 with extensive water defences.

The castle deteriorated during several centuries of disuse.