History of the Roman Empire
Theodosius was the last Emperor who ruled over the whole Empire. After his death in 395, he gave the two halves of the Empire to his two sons Arcadius and Honorius; Arcadius became ruler in the East, with his capital in Constantinople, and Honorius became ruler in the West, with his capital in Milan and later Ravenna. The Roman state would continue to have two different emperors with different seats of power throughout the 5th century, though the Eastern Romans considered themselves to be the only ones who were fully Roman. Latin was used in official writings as much as, if not more than, Greek and the two halves were nominally, culturally and historically, if not politically, the same state.
The Fall of the Roman Empire (film)
The film's plot is only loosely based on actual historical events. However, in the long-established view of Roman history, Marcus Aurelius is considered as the last of the Five Good Emperors whose time is considered the best of Roman imperial history. Commodus is generally considered to have fallen far below the standard set by his father and the four earlier Emperors, and his reign is considered as the beginning of the decline - though that would still take several centuries.