Sassanid Persia & Islam.

The Persians defeat the Islamic armies at Nahavand (641 AD), thereby preventing the Muslim conquest. Mesopotamia is divided temporarily between Persia and the caliphate. Could the Muslims and Persia eventually form anti-Byzantine alliances or do all three empires continue to fight each other?
 

Philip

Donor
Mesopotamia is divided temporarily between Persia and the caliphate. Could the Muslims and Persia eventually form anti-Byzantine alliances or do all three empires continue to fight each other?

With Mesopotamia divided, I don't see much Sassanid-Caliphate cooperation. I think a Sassanid-Byzantine agreement to do with the new enemy is more likely -- they can get back to beating upon one another later.
 
POD needs to be in the Byzantine-Sassinid War being not as costly, perhaps. Maybe a peace treaty earlier on?

I definitely don't see them cooperating with the Caliphate. If anything, the common alliance against the Caliph seems most likely.
 
I definitely don't see them cooperating with the Caliphate. If anything, the common alliance against the Caliph seems most likely.

Seconded. I can see the Romans and Persians allying here, as they did to keep out steppe barbarians from their northern frontiers in the Caucasus.
 
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