arab conquests

During the siege of Bahurasīr, a Sassanid emissary relayed a message from Shahanshah Yazdegerd III to the Arabs, proposing a new border along the Tigris River, with the lands to the west designated as Arab territory and those to the east as Sassanid. IOTL, this offer was rejected, and the Arabs...

The POD is that for one reason or another(different emperor or Shah, quicker end to the war, the war never starts to begin with) the last Byzantine–Sasanian War of 602–628 doesn't happen or it could even end earlier, the important is that while both empires end up battered they don't have the...

From my understanding, a major component in the success of the Rashidun Caliphate's expansion was that the Byzantines and Persians were simply exhausted from fighting each other with major occupations of the opposing empire's territory that went far beyond any previous Byzantine-Sassanian...

what if sassanids reinforced Byzantines in the middle of battle of Yarmuk as a friendly gesture to form an alliance will this surprise attack win the battle? will this cement an allaince and stop arabs ?

pls answer follow up questions what if Maurice conquers Persia or atleast Mesopotamia and persian gulf coast using Sasanian civil war of 589-591 since in OTL it was with his army Khosrow II reconquered iran He does this by having Khosrow II killed secret after he is exiled to Byzantine empire...

In the 7th Century, Narsieh, son of Peroz III, and the grandson of Yazdegerd III, the last Sasanian Shah. He was escorted back to Persia with a Chinese army led by Pei Xingjian in 679, in order to restore him to the Sasanian throne, but the army stopped in Tokharistan. Pei Xingjian fought...

Inspired by the Constans II triumphant thread. What if Justinian II had succeeded in his known plans? Or, rather, what POD would allow for him to have the most success as a ruler? What would be the consequences of this? I want to avoid wank, however. What's the best case scenario?

We all know what happened after the death of Muhammad. The newly Muslim Arabs spread out of Arabia, warring against both the Byzantine and Sasanian Empires. But while they completely conquered the former, the latter managed to hold on despite the beating it took. Your challenge is to have it so...

Let's say that due to internal issues, it takes longer for the Arabs to be properly united after the death of Muhammad. How does this influence the course of events? Could Antioch remain held by the Romans? Could Mesopotamia be kept by the Persians? Or would the Arabs still conquer as they did...

Within a century of the death of Muhammad, the newly Islamized Arabs had managed to conquer vast territories. In the process, they had destroyed the Sasanian Empire, and if they'd been slightly luckier, they could very well have done the same to the Byzantine Empire. Now, of course, there are...