According to Runciman (1977), Heraclius I, Eastern Roman Emperor from 610 to 641, originally considered abandoning Constantinople in the war with Sassanid Persia. Constantinople had been suffering throughout the campaign against the Persians as grain was the primary source of food for the city and Egypt, the provider, had been lost. Heraclius believed that moving the capital to Carthage would make it easier to provide the population with food. Attempting to save the Empire enough money to allow Constantinople to remain the capital, Patriarch Sergius I of Constantinople traded the free bread citizens received in the city, a practice from older Roman times, as the government could no longer afford this. Together with his close ties with the emperor, Sergius managed to convince Heraclius to stay in Constantinople.
What if this doesn't happen, and Heraclius moves the ERE's capital to Carthage? For sure he's going to lose his credibility and throne, possibly more (look what happened when Constans II Pogonatus tried to leave for Syracuse), and the Persians will likely seize Constantinople and win the war, but what else would logically happen? And how do the Arabs play into this?
What if this doesn't happen, and Heraclius moves the ERE's capital to Carthage? For sure he's going to lose his credibility and throne, possibly more (look what happened when Constans II Pogonatus tried to leave for Syracuse), and the Persians will likely seize Constantinople and win the war, but what else would logically happen? And how do the Arabs play into this?