Glamorgan
The medieval lordship of Glamorgan was formed after the Norman invasion of the Welsh kingdom of Morgannwg in the last years of the eleventh century. The lordship extended from the River Rhymni in the east to the upper reaches of the Tawe in the west, and was bounded to the north and south by the lordship of Brecon and the Bristol Channel respectively. Glam. Co. Hist. ed. T.B. Pugh, iii. 1-11. The Union legislation of the mid-sixteenth century enlarged the lordship to form the new county of Glamorgan by uniting it with the western lordships of Gower and Kilvey.
