Heraclius
Heraclius I (full name: Imperator Caesar Flavius Heraclius Augustus;[1] AD 575 - February 11, 641) was an Emperor of the Eastern Roman Empire who reigned from AD 610 to AD 641. As Roman Emperor, his rule is remembered for the Muslim Conquest of Roman Syria, most of Roman Egypt and Sassanid Persia. He was an energetic ruler, winning the Sassanid-Persian War despite how unfavorable the odds were for the Romans and he recovered the True Cross from the Persians. However, his victories against the Persians would be tragically undone by the unexpected Muslim Invasion of Syria and Egypt six years after the end of the decades long war between Sassanid Persia and Rome.
References
Theophanes, & Turtledove, H. (2011). The chronicle of Theophanes: Anni mundi, 6095-6305 (A.D. 602-813). Philadelphia, PA: University of Pennsylvania Press.