I read this story sometime in the past twenty years. It was in an anthology but I don't remember the title. A tyrant rules the world and soldiers would assault his fortress. One soldier whose father had died assaulting it survives the assault. He kills the tyrant to find a list of names of men. He realizes that the tyrant is a series of men who realize the world is only united because there is a tyrant. He also finds that his father had been one of the men. I had this book the story was in but in my military career I misplaced it. Anyone have a clue what the title and author is?