"Oh, my dear Vimes, history changes all the time. It is constantly being re-examined and re-evaluated, otherwise how would we be able to keep historians occupied? We can't possibly allow people with their sort of minds to walk around with time on their hands."

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That's one of the central problems of history, isn't it, sir? The question of subjective versus objective interpretation, the fact that we need to know the history of the historian in order to understand the version that is being put in front of us.

— Julian Barnes