Arthur fought many of his battles in the North East of Wales around Welshpool near Caer Fawr a place where there is a Gap in what is today called Offas Dyke.

Offa was indeed a powerful King, probably the first King of England up as far of Northumbria and he would have had a considerable army therefore access to a lot of manpower.

The only problem with this scenario is that Offa was 200 years after Arthur and yet time and time again Arthur is fighting to hold the line at this gap in the defences.

The other concern is that the Anglo Saxons have no record of having built other walls even Wansdyke has been acknowledged as pre Anglo Saxon.

This tends to point to the fact that the wall had to be built before Arthurs time.

So who could have built it?

Whoever it was would have to be around before Arthur and have had access to a vast amount of labour and be well organised with the relevant skills.

Ancient texts point to the wall having been built by the Roman emperor Severus around 208 and Roman artefacts (coins, brroches and jewellry) found in the wall certainly indicate that the wall was there at that time and therefore at the time Arthur was active as a Commander.