I was reading this the other day, and I remembered now. The people of God were not only in the Roman empire. They were spread out over other empires too.
Here the Christians in the territory of the Sasanian empire:
The Sasanian empire persecuted Christians as well, on and off, during its dominion. Probably everywhere Christians went, were persecuted. We know about Roman persecution the most because of our Western history records, and just culture.
The same with the Islamic Caliphates nations, persecutions, on and off, while the Pope was in power too.
I think the idea that the prophetic focuses on the people of God who are dispersed across empires, but also on the promise land on the Middle East and what happens there makes the most sense.
EB,
[
Daniel 2:29, 39 NKJV] 29 "As for you, O king, thoughts came [to] your [mind while] on your bed, [about] what would come
to pass after this; and He who reveals secrets has made
known to you what will be. ... 39 "But
after you shall arise another kingdom inferior to yours; then another, a third kingdom of bronze, which shall rule over all the earth.
I think the prophecy is indeed about the fate of Babylon's dominion and its relationship with the promise land.