20% done with Lost to the West: The Forgotten Byzantine Empire That Rescued Western Civilization

While almost certainly apocryphal, his last words “You have won, Galilean” are a tidy segue from Paganism to Christianity and he was right that paganism was pretty much dead by then. I’ll go a step further and say he does serve as a reminder of political religious extremism and also as to what Tolstoy says is the inability of a single person to influence the inevitable tide of history.