The Lordship of Dinefwr is a historic area located in Wales, specifically in Carmarthenshire. It was established in the medieval period and was an important center of power for the Kingdom of Deheubarth. The lordship included the town of Llandeilo and the surrounding lands, which were significant for agriculture and trade. The most notable landmark within the Lordship is Dinefwr Castle, which dates back to the 11th century. The castle served as a royal residence and a symbol of the local rulers' authority. Today, the site is part of the Dinefwr Park, a designated National Nature Reserve and a popular tourist destination.