muslim conquests

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...

I think it's fair to say the Islamic conquest of Egypt was relatively important for world history- it enabled the caliphates to become the biggest world powers for centuries, isolated Ethiopia from other christians, and created the North Africa we know today (and Spain & Portugal but in a very...