Heraclius (575 - 641). Heraclius was the Byzantine emperor from 610 to 641. His rise to power began in 608, when he and his father, Heraclius the Elder, the exarch of Africa, led a revolt against the unpopular usurper Phocas. Heraclius's reign was marked by several military campaigns. The year Heraclius came to power, the empire was threatened on multiple frontiers. Heraclius immediately took charge of the Byzantine-Sasanian War of 602-628. The first battles of the campaign ended in defeat for the Byzantines; the Persian army fought their way to the Bosphorus but Constantinople was protected by impenetrable walls and a strong navy, and Heraclius was able to avoid total defeat. Soon after, he initiated reforms to rebuild and strengthen the military. Heraclius drove the Persians out of Asia Minor and pushed deep into their territory, defeating them decisively in 627 at the Battle of Nineveh. The Persian king Khosrow II was overthrown and executed by his son Kavad II, who soon sued for a peace treaty, agreeing to withdraw from all occupied territory. This way peaceful relations were restored to the two deeply strained empires. Heraclius lost many of his newly regained lands to the Muslim conquests. Emerging from the Arabian Peninsula, the Muslims quickly conquered the Sasanian Empire. In 634 the Muslims marched into Roman Syria, defeating Heraclius's brother Theodore. Within a short period of time, the Arabs conquered Mesopotamia, Armenia and Egypt. Heraclius entered diplomatic relations with the Croats and Serbs in the Balkans. He tried to repair the schism in the Christian church in regard to the Monophysites, by promoting a compromise doctrine called Monothelitism. The Church of the East was also involved in the process. Eventually this project of unity was rejected by all sides of the dispute. Heraclius was the eldest son of Heraclius the Elder and Epiphania, of a family of possible Armenian origin from Cappadocia, with speculative Arsacid descent. Beyond that, there is little specific information known about his ancestry. His father was a key general during Emperor Maurice's war with Bahram Chobin, usurper of the Sasanian Empire, during 590. After the war, Maurice appointed Heraclius the Elder to the position of Exarch of Africa. Main article: Heraclian revolt In 608, Heraclius the Elder renounced his loyalty to the Emperor Phocas, who had overthrown Maurice six years earlier. The rebels issued coins showing both Heraclii dressed as consuls, though neither of them explicitly claimed the imperial title at this time. Heraclius's younger cousin Nicetas launched an overland invasion of Egypt; by 609, he had defeated Phocas's general Bonosus and secured the province. Meanwhile, the younger Heraclius sailed eastward with another force via Sicily and Cyprus. As he approached Constantinople, he made contact with prominent leaders and planned an attack to overthrow aristocrats in the city, and soon arranged a ceremony where he was crowned and acclaimed as Emperor. When he reached the capital, the Excubitors, an elite Imperial Guard unit led by Phocas's son-in-law Priscus, deserted to Heraclius, and he entered the city without serious resistance. When Heraclius captured Phocas, he asked him Is this how you have ruled, wretch? Phocas's reply, And will you rule better?, so enraged Heraclius that he beheaded Phocas on the spot. He later had the genitalia removed from the body because Phocas had raped the wife of Photius, a powerful politician in the city. On October 5, 610, Heraclius was crowned for a second time, this time in the Chapel of St. Stephen within the Great Palace; at the same time he married Fabia, who took the name Eudokia.