Heraclius (r. 610–641) is the definition of a military emperor—a ruler who didn’t just sign orders, but personally carried the war on his shoulders. When he took the throne in 610, the Byzantine Empire was in crisis. The Persians were advancing fast, taking province after province. The state was broke, politically unstable, and losing its most valuable territories. In that moment, a cautious emperor might have accepted permanent defeat as the price of survival. Heraclius chose the opposite. He r