The Sack of Rome of May 1084 is a Norman sack, the result of the pope's call for aid from the duke of Apulia, Robert Guiscard.
"Human history becomes more and more a race between education and catastrophe... Yet, clumsily or smoothly, the world, it seems, progresses and will progress."
― H.G. Wells, The Outline of History, Vol 2 (1920)