Heraclius was the Emperor of the Byzantine Empire from 610 to 614. He made Greek the official Byzantine Language. He is known for his many military campaigns as the empire was being threatened on multiple frontiers. He successfully pushed the Persians out of Asia Minor in the Battle of Nineveh bringing peace between the two empires. However, that was short lived as he soon faced threats from Muslims losing Mesopotamia, Armenia, and Egypt. He also attempted to fix the schism in the Catholic Church but ultimately failed.
Despite ultimately losing territory, Heraclius is considered one of the greatest Roman rulers. He reduced corruption and reorganized the military. His most important legacy comes the recovery of “The True Cross” from the Persians. The True Cross is the remanents of the cross in which Jesus was sacrificed. Heraclius returned the cross to Jerusalem in 629 (or 630). He was labeled the first crusader. However historical accuracy of this tale has been widely debated amongst scholars claiming that the True Cross was lost and the cross that Heraclius brought back to Jerusalem was a mistake.
Heraclius was married twice, once to Fabia Eudokia and then to his niece Martina. He had two children with Fabia and then nine children with Martina. Two of his sons became Emperor – one from Fabia (Heraclius Constantine [Constantine III]) and one from Martina (Constantine Heraclius [Heraklonas]). When Heraclius was dying he left the empire to be ruled by both sons with Martina as Empress. In 641, 11-year-old Constans II, son of Constantine III took over as Emperor.