On Byzantium
https://youtu.be/2JHCfe86A8U
Fascinating. Right from the beginning where Paul Cooper tells us how the Mediterranean Sea was created (offset Part I, 8 minutes).
To his explanation of how the Eastern wing survived for another thousand years after the fall of Rome.
And America has managed 80 years and looks to be on its way out, having learnt nothing of the power of diplomacy from the rulers of Byzantium.