Flavius Phocas(602-610) was one of the worst emperors Byzantium had. Taking advantage of pay disputes to seize power, he proceeded to brutally purge his opponents, mismanaged the army and bureaucracy, and triggered a 26-year long devastating war with the Sassanids, which of course he completely failed in managing, losing a huge portion of the empire. The Exarch of Africa, Heraclius, staged a rebellion, and usurped the throne, managing to turn back the Sassanids. However, a new threat would rise from the deserts of Arabia in the form of Islam. What if Phocas stayed in power and his generals defeated and killed Heraclius? Would he still be overthrown? Can the Sassanids successfully take Syria and Egypt? How would Islam be affected? How screwed are the Byzantines?