Oystermouth Castle, a Norman fortress dating to 1106, dominates the hills of Mumbles overlooking Swansea Bay in Wales. Built by William de Londres following the Norman conquest of the Gower Peninsula, the castle was initially destroyed by Welsh forces in 1116 but subsequently rebuilt and expanded by the powerful de Braose family, who made it their principal residence in the 13th century. King Edward I visited the castle in 1284, testament to its importance as a lordship seat. After changing hands in 1927, when the Duke of Beaufort gifted it to Swansea Corporation, extensive restoration work has stabilized the medieval structures. Managed today by the City and County of Swansea, Oystermouth Castle stands as a Grade I listed monument, offering visitors panoramic views and insight into Norman-Welsh military heritage.