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Shock is probably the predominant emotion evoked by the decision of Pope Benedict XVI to resign at the end of February. Given that the last papal resignation took place 600 years ago, it’s understandable that the world has got used to the idea that being pope is a life sentence. Indeed, previous popes seem to have got used to it as well. Some of them, including Benedict’s immediate predecessor, were martyrs to the job, and not entirely metaphorically.