After Julian's death on campaign in Persia in AD 363, his successors struggled to stave off growing barbarian invasions in the west and Persia's new-found dominance in the east. They did their best to keep the show on the road but the cracks in Rome's armour were beginning to show. Indeed, for the emperor Valentinian, it all proved too much when he literally burst a blood vessel and died in a fit of anger while negotiating with the German tribe, the Quadi.

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