East Orchard Castle near St Athan in the Vale of Glamorgan, Wales, is a ruined domestic manor house with origins dating primarily to the 14th century, despite its castle designation. Built by the Berkerolles family following the Norman conquest of Glamorgan in 1091, the site complex includes a manor house, barn, chapel and dovecote. The castle was destroyed during Llywelyn Bren's revolt around 1316 and gradually dismantled from 1756 onwards. Situated on private land away from modern development, East Orchard remains one of south Wales' most atmospheric historic ruins, offering a tranquil setting for exploring medieval domestic architecture and the region's complex political history.