I think that it could be set in the times when there was one king in tribal britain before the romans conquered. This means that this king is now a roman slave, as were many of the tribal leaders after the romans had defeated them. In the chorus "Here Jerusalem bells are ringing, Roman Cavalry Choirs are singing," this represents the Christians who were basically the romans who took over britain and forced their beliefs onto the britons, Just what first came into my head when I saw it - does anyone else agree with me?