There is no historians' consensus about the ninth century. Opinions have been both highly judgmental and bewilderingly disparate. The most common diagnosis has been of disintegration and decline: the terminal illness of the Carolingian state. But some more sanguine observers have claimed to find here transformation and a political creativity decisive for the future of western Europe. On any reckoning, the ninth century was an important period. Yet it remains as true as when Walter Schlesinger made the observation twenty years (...) ago that a history of the ninth century in and for itself has still to be written. When it is, an interpretation of the events between 840 and 843 will surely be given a central place. For it was during those years that Carolingian Europe underwent most obviously those changes which historians have held characteristic and seminal in the century as a whole. At the beginning of 840 the Carolingian Empire persisted as a political entity; in 843 it no longer did so. The quest for an understanding of what happened during these critical years must start from a thorough reexamination of the relevant sources, and a number of recent studies show that this task is already well under way. But one text, though not wholly neglected by modern scholarship, still stands in need of closer attention and reappraisal: the Histories of Nithard. (shrink)