Heraclius Constantine, or Constantine III, was the eldest son of the Byzantine emperor Heraclius and his first wife Eudocia, born May 3, 612. He was also the older half-brother of Heraclonas, the son of Heraclius' second wife Martina. For political reasons, Heraclius considered Martina to be mother of them both. Constantine became emperor when Heraclius died in 641, and during his reign the Arabs conquered Egypt. He died of tuberculosis after only four months, leaving Heraclonas sole emperor; a rumor that Martina had him poisoned led to political unrest during Heraclonas' reign.
HeracliusConstantine, age 28, was the only son of Heraclius' first marriage to Eudokia (Fabia) while Heraclonas, age 15, was the eldest son of Martina, Heraclius' niece and second wife.
She constantly opposed the policies of HeracliusConstantine, and this opposition led to the development of two factions within the government.
Haldon, J.F. Byzantium in the Seventh Century: the transformation of a culture.
Constantine the Great was born Flavius Valerius Constantinus at Niš, in what is now Serbia and Montenegro, son of the commander Constantius Chlorus (later Constantius I) and Helena (later Saint Helena), a camp follower.
Constantine’s adherence to this faith is evident from his claim of having had a vision of the sun god in 310 while in a grove of Apollo in Gaul.
Constantine the Great unified a tottering empire, reorganized the Roman state, and set the stage for the final victory of Christianity at the end of the 4th century.