One of a number of locations across the Staffordshire Moorlands reputed by local lore to have been the site of a great battle in ancient times (Longnor and Illam are two others that spring to mind). In one version of the legend the battle was between Romans and a local tribe, in another between the (Christian) Mercian Saxons and the (Pagan) Danes.
Therefore it has been said that the burial mound on Callow Hill known as Cat Low is the final resting place of a great warrior/leader/King or even Centurian. who fell in combat at that battle. Perhaps that helps to explain why it has been excavated so often.