Until 1974,
Glamorgan, or sometimes
Glamorganshire, was an administrative county in the south of Wales, and later classed as one of the thirteen historic counties of Wales. Originally an early medieval petty kingdom of varying boundaries known in Welsh as Morgannwg, which was then invaded and taken over by the Normans as the Lordship of Glamorgan. The area that became known as Glamorgan was both a rural, pastoral area, and a conflict point between the Norman lords and the Welsh princes. It was defined by a large concentration of castles.