English: Caerphilly Castle Caerphilly Castle viewed from the Western Island. The castle is the largest in Wales and is unusual in that it was not built by a king but by an immensely powerful magnate, ‘Red’ Gilbert de Clare (1243-1295), Earl of Gloucester and Hertford, and Marcher lord of Glamorgan. Incredibly much of the building was completed between 1268-71 and therefore it predates the large castles of north Wales built for Edward I. (Photo credit: Wikipedia)
Unitary authority in south eastern Wales, effective from 1996 and with the status of a borough. It was formed by uniting the Rhymney Valley district in Mid Glamorgan and the Islwyn district in Gwent.
It takes its name from the town of Caerphilly, north of Cardiff, which boasts one of the finest of 13th century castles, built by the Clare Earl of Gloucester and Lord of Glamorgan.