Well I think it could refer to all the rulers above: Louis xvi, Napoleon, Julius Caesar, Augustus Caesar or other great rulers from the history books who came to power or ruled in times of turmoil. Some of whom were greedy, indulgent and just thought it their right.(like Louis xvi). Some had the best of intentions but Power corrupts and absolute power corrupts absolutely. The history books are littered with such stories. Yes, I think it does reference the church, too because the Church generally supported the monarchs. At least in Europe for they claimed to be ruled by divine right. Note however that at Napoleons coronation he took the crown from the Bishops hands and put it on himself as it to suggest the church had no power over him. He saw himself as a reincarnation of Charlemagne who united Europe for the first time since the Romans and was called the "Holy Roman Emperor". However Napoleon pretty much destroyed France and his ambitions weren't quite as noble. I don't believe it applies to Jesus Christ because he came to us in the form of a humble carpenter, really just a poor man who talked of love and forgiveness and denounced the greed of the money lenders at the Temple. Maybe that's why the line says "People couldn't believe what I've become". The reference to sword, shield and mirror: I think he is perhaps asking for forgiveness. He looks at himself in the mirror and sees what he became and is looking for forgiveness or perhaps redemption through his menial work. Maybe he thinks he may have found it and that's why St. Peter won't call his name on the list of the damned.