AH Challenge: Greeks to the left, Persians to the right, Arabs in the middle

Basically, your challenge is to create a situation in late-antiquity/the early middle-ages in which there are the following polities:

1. A Byzantine Empire occupying much the same position it did IOTL after the Arab conquests: Anatolia west of the Taurus mountains and fluctuating parts of the Balkans. North Africa is yours to dispose of as you please.

2. A monophysite state in Egypt. Can be a rebellious Byzantine state, a native state, anything you can think of, it just has to be monophysite and independent of other powers.

3. An Arab Empire in the Levant and Mesopotamia. They can have as much else as you want to give them as long as it does not conflict with other requirements.

4. An Iranian state past Zagros mountains. This is, I think, going to be the most difficult requirement, so good luck. The Iranian empire can extend as far east as you want to take it. Personally, I've got some romanticism for a Iranian, civilized Central Asia, so bonus points for an empire that stretches towards the historical Achaemenid border on the Aral Sea.

I'll make a map of the basic situation I want later on. Have at it.
 
Quite simple, no Islam, Lakhmids or Ghassanids, or the pagan Arabs get their act together and invade Mesopotamia and Levant. The rest just writes itself. Egypt was ready for rebellion, and no Islamic conquest can achieve this.
 
I'm with Guerilla republic: no arab expansion, or at least one which has been tinkered with significantly. Most of the necessary preconditions are in place. Maybe the Byzantine-Sassanid war ends with the Persians in a slightly better shape. Arab exodus is delayed a few years, allowing Constantinople's control over Egypt to fray even further. Egypt takes advantage of the arabs to declare independence, and beats off incursions through the Sinai; a stronger Sassanid state is able to maintain its integrity, holding a line in the Zagros mountains. The rump Byzantines, for their part, suffer a number of setbacks, but a bit more luck and competence means that they can contain the arabs to the Levant. The empire emerges weakened by the (seemingly permanent) loss of egypt and everything south of Anatolia, but the core areas in Greece and the Anatolian heartlands are secure. For the moment, Tunisia and that region remains under Constantinople's control, although the situation there should be interesting to watch (how does no arab conquest effect the region? a lot). One also wonders what becomes of Italy, with a relatively stronger Byzantine state that has to watch its back...
 
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