Even though this BBC documentary is over 40 years old, the script is superb and is quite well done.
John Julius Norwich tells the dramatic story of the fall of Constantinople and the Byzantine Empire, followed by the rise of the Ottoman Turks in the 15th Century. Using monuments in Istanbul to show the formidable artistic and intellectual achievements of the Byzantines, Norwich vividly describes the last scenes of Greek Orthodox Christianity from within the Hagia Sophia.
CHANNEL: BBC 2
FIRST BROADCAST: 25 October 1967
DURATION: 32 minutes 42 seconds
See the documentary here.