Until 1974, Radnorshire was an administrative county in mid Wales, later classed as one of the thirteen historic counties of Wales. It covered a sparsely populated area, and was bounded to the north by Montgomeryshire and Shropshire, to the east by Herefordshire, to the south by Brecknockshire and to the west by Cardiganshire.

Until 1974, Montgomeryshire was an administrative county in mid Wales, later classed as one of the thirteen historic counties of Wales. It was named after its county town, Montgomery, which in turn was named after one of William the Conqueror's main counsellors, Roger de Montgomerie, who was the 1st Earl of Shrewsbury.