Northumbria's southern frontier was arguably the most important political boundary inside pre‐Viking England. It has, however, attracted little scholarly attention since Peter Hunter Blair's seminal article in Archaeo‐logia Aeliana in 1948, which later commentators have generally followed rather uncritically. This essay reviews his arguments in the light of more recent research and casts doubt on several key aspects of his case: firstly, it contests his view that this boundary was fundamental to the naming of both southern and northern England and its kingdoms; secondly, it queries the supposition that the Roman Ridge dyke system is likely to have been a Northumbrian defensive work; thirdly, it critiques the view that the Grey Ditch, at Bradwell, formed part of the frontier; and, finally, it argues against the boundary in the west being along the River Ribble. Rather, pre‐Viking Northumbria more probably included those parts of the eleventh‐century West Riding of Yorkshire which lie south of the River Don, with a frontier perhaps often identical to that at Domesday, and it arguably met western Mercia not on the Ribble but on the Mersey. It was probably political developments in the tenth century, and particularly under Edward the Elder and his son Athelstan, that led to the Mercian acquisition of southern Lancashire and the development of a new ecclesiastical frontier between the sees of Lichfield and York on the Ribble, in a period that also saw the York archdiocese acquire northern Nottinghamshire.
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