ctesiphon

AH discussion. With a time period of 600 to 1453, what city or cities would you find exceptionally defensible, economically dominant and culturally important. Also I would like to compare these cities in terms of their relevance for the period. Especially when it comes to comparing the...

What would be the most likely time for a Persian Empire (Mesopotamia + Persian plateau) with a Christian (Nestorian?) ruler class to emerge? From what I understand, in Sassanian Persia, Christianity was beginning to spread so that almost all of Mesopotamia (where Ctesiphon itself, seat of the...