Post by gggg gggghttps://www.thecollector.com/umayyad-caliphate-empire-largest-islamic-state/
Fairly interesting.
It ties in considerably with another of the books I picked up
the other day:
"What Went Wrong? The Clash Between Islam and Modernity
in the Middle East" by Bernard Lewis.
I will try to give some ideas in another post on it.