This period is usually treated as “The Fall of the Roman Empire”. It covers the ‘long’ 5th century.  What occurred was not the collapse of civilization and the onset of barbarism and “The Dark Ages”, as is popularly believed, but the collapse, and then partial restoration, of a centralized political régime. This is not at all the same thing as the End of Civilization. In fact ancient civilization continued uninterrupted. What happened was the acceleration, and an increase in scale, of a process that had been evident for centuries: the gradual replacement of the Roman military structures by a largely or partially assimilated German warrior caste, originating from the frontier regions of the Empire. This change in military personnel, when scaled up from the late 300s, brought with it a political alteration: most of the western provinces effectively became autonomous  from the central Imperial government at Ravenna. But underneath this military and political transmutation, life in the ancient Mediterranean world went on, as it had for over a millennium.