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Constantine III
Emperor of the Byzantine Empire
Roman coin depicting, on its face, Constantine with his father Heraclius and brother Heraklonas
Reign February 641 – May 641
Full name Heraclius Novus Constantinus
Died May 641 (aged 28 or 29)
Predecessor Heraclius
Successor Heraklonas
Consort Gregoria
Issue Constans II
Dynasty Heraclian Dynasty
Father Heraclius
Mother Eudokia
Heraclian dynasty
Heraclius 610–641
with Constantine III as co-emperor, 613–641
Constantine III 641
with Heraklonas as co-emperor
Heraklonas 641
Constans II 641–668
with Constantine IV (654–668), Heraclius and Tiberius (659–668) as co-emperors
Constantine IV 668–685
with Heraclius and Tiberius (668–681), and Justinian II (681–685) as co-emperors
Justinian II 685–695, 705–711
with Tiberius as co-emperor, 706–711
Preceded by
Followed by
Twenty Years' Anarchy

Constantine III (Greek: Κωνσταντῖνος Γ΄; 3 May 612 – 20 April or 24/26 May 641) was Byzantine Emperor for four months in 641. He was the eldest son of the Byzantine Emperor Heraclius and his first wife Eudokia.

Constantine's birth name was Heraclius Novus Constantinus, (Greek: Ἡράκλειος νέος Κωνσταντῖνος), which was also the official name under which he reigned. The name Constantine became established in later Byzantine texts as short for the Emperor and has become standard in modern historiography. In terms of official Imperial nomenclature, the style "Constantine III" would be more appropriate for his son Constans II (r. 641–668).

Constantine was crowned co-emperor by his father on 22 January 613 and shortly after was betrothed to his cousin, Gregoria, a daughter of his father's first cousin, Nicetas. As the couple were second cousins, the marriage was technically incestuous, but this consideration must have been outweighed by the advantages of the match to the family as a whole. Furthermore, its illegality paled into insignificance beside Heraclius' marriage to his niece Martina the same year.

Constantine and Gregoria married in 629 or perhaps early 630 and in that year their first child, Constans II was born. Their second child was another son, Theodosius. They also had a daughter named Manyanh who later married the last Sassanid King of Persia, Yazdgerd III and had issue.

Constantine became senior Emperor when his father died in 641. He reigned together with his younger half-brother Heraklonas, the son of Martina. His supporters feared action against him on the part of Martina and Heraklonas, and the treasurer Philagrius advised him to write to the army, informing them that he was dying and asking for their assistance in protecting the rights of his children. He also sent a vast sum of money, more than two million solidi (gold coins), to Valentinus, an adjutant of Philagrius, to distribute to the soldiers to persuade them to secure the succession for his sons after his death. Indeed, he died of tuberculosis after only four months, leaving Heraklonas sole emperor. A rumor that Martina had him poisoned led first to the imposition of Constans II as co-emperor and then to the deposition, mutilation, and banishment of Martina and her sons.


By his wife Gregoria, the daughter of Niketas, Constantine III had two sons and a daughter:

  • Constans II, who succeeded as emperor
  • Theodosius
  • Manyanh, who married Yazdgerd III, last Sassanid Emperor of Persia


Media related to Heraclius Constantine at Wikimedia Commons

Constantine III (Byzantine emperor)
Born: 3 May 612 Died: 20 April or 24/26 May 641
Regnal titles
Preceded by
Byzantine Emperor
with Heraclius, 613–641
Heraklonas, 641
Succeeded by

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