Marcus Aurelius [Alec Guinness] gives an integrating speech to all peoples. The extremely large Roman Empire is becoming fragile for its own monstruosity and must include the integrated nationalities as romans. A lesson to be followed on days of walls and no bridges.
IMDb
http://www.imdb.com/title/tt0058085/
The Fall of the Roman Empire (original title)
3h 8min | Drama, History, War | 26 March 1964 (USA)
The death of Marcus Aurelius leads to a succession crisis, in which the deceased emperor's son, Commodus, demonstrates that he is unwilling to let anything undermine his claim to the Roman Empire.
Director: Anthony Mann;
Writers: Ben Barzman (screenplay), Basilio Franchina (screenplay),
Philip Yordan (screenplay), Edward Gibbon (based on "The History of the Decline and Fall of the Roman Empire") (uncredited)
Stars: Sophia Loren, Stephen Boyd, Alec Guinness, James Mason, Christopher Plummer, Omar Sharif.