The document summarizes the decline of the Western Roman Empire between 410-565 AD and the rise of the Eastern Roman (Byzantine) Empire under Emperor Justinian. It describes the sack of Rome in 410 AD by the Visigoths and the subsequent invasions by Attila the Hun and the Vandals. By 476 AD, the Western Roman Empire had fallen. The document then focuses on Emperor Justinian's reconquest of former Western Roman territories in North Africa and Italy in the 530s-540s AD led by his general Belisarius, establishing the Byzantine Empire as the heir of Rome.