The Britain of 1,800 years ago was a much different place, with no clear distinction between what is now Wales, Scotland and England but a collection of regions run by indigenous tribes under Roman occupation.
There were areas where even the Roman army feared to tread such as the north of Scotland, where two great walls were built to keep the troublesome locals out, namely the walls of Emperors Hadrian and Antonius.
There was a third great wall constructed during the Roman occupation however, the location of which has seen great debate amongst scholars over the years and that is the wall of the Emperor Septimus Severus.
Current thinking leans towards this wall being a restoration of Hadrian's earlier construction but even the records kept by the Romans themselves points to this being impossible.
Recent research has pointed to this lost wall being the remains we now know as Offa's Dyke - a possibility hotly disputed by the Offa's Dyke Trust.
The Trusts source for the Offa claim comes from a reference in an obscure Medieval text attributing the dyke to the 8th century Saxon ruler.
This view is held despite there being no archaeological evidence of the Saxons building this impressive structure as well as having no history of building such vast earthworks anywhere else!
The fact that the only archaeological evidence found to date from within the dyke is Roman only deepens the mystery further....