Dinefwr was a local government district of Dyfed, West Wales from 1974 to 1996. It was named after Dinefwr Castle which was the royal capital of the Kingdom of Deheubarth and one of the three principal royal courts of Wales. It was formed by the merger of the borough of Llandovery, the urban districts of Ammanford, Cwmamman and Llandeilo along with Llandeilo Rural District, from the administrative county of Carmarthenshire. In 1996 the district became part of a new Carmarthenshire unitary autho… (More on Dinefwr)