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.

Earl of Shrewsbury is a hereditary title of nobility created twice in the Peerage of England. The second earldom dates to 1442. The holder of the Earldom of Shrewsbury also holds the title of Earl of Waterford (1446) in the Peerage of Ireland and Earl Talbot (1784) in the Peerage of Great Britain. Shrewsbury and Waterford are the oldest earldoms in their peerages held by someone with no higher title, and as such the Earl of Shrewsbury is sometimes described as the premier earl of England and Ireland.