What if the Byzantine-Sassanid war of 602–628 never happened?

What if the Sassanid Persia empire never invades the eastern Roman empire in 602 AD? Would the two powers remain strong enough to successfully crush any excursions of Arabs out of the peninsular? How long could the current power balance in the region last?
 
If you want, take a look using the search function, as this question has been discussed before at length. That might give you the answers you seek without you having to wait for a similar discussion to take place here.
 
If you want, take a look using the search function, as this question has been discussed before at length. That might give you the answers you seek without you having to wait for a similar discussion to take place here.

The search function doesn't seem to work for me. It just spends several seconds loading, then gives me nothing. I'm new to this site, so I don't know if I'm just doing something wrong.
 
Well avoiding the war is easy, just kill Phokas before he can usurp the thrown from Maurice. The Persian Shahanshah was a personal friend of Maurice and only invaded because the man who put him on his thrown was overthrown and killed.

As to what happens without the war between the two, Islam will be stuck in Arabia for at least another century before it can expand further afield, which will significantly shrink the extent of it's future reach. Also I'd imagine Persia and the Eastern Romans will have a new enemy on their border that can keep their attention away from each other.
 
I hesitate to say too much about the goings on in Iran, but from my hazy knowledge the Sasanian monarchy was probably on the decline anyway, as was orthodox Zoroastrianism. So the Sasanians may well still be replaced, but it will be by another Iranian speaking dynasty with Iranian religious traditions, rather than by Arabs with Abrahamic religious traditions.

As for the Romans (the seventh and eighth century transition to the imperial period we recognise as "Byzantine" won't happen ITTL), it depends on the PoD, but in a scenario where Maurice and his heirs hold the throne, I expect to see further attempts to consolidate the Balkans in terms of military activity and more tries at creating an inclusive religious formula to bring the anti-Chalcedonian Christians of Syria back into communion. This will quite likely cause ructions in Italy and Africa.
 
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