Constantine III, Byzantine emperor (d. 641)
Heraclius Constantine (Latin: Constantinus; Greek: Ἡράκλειος Κωνσταντῖνος, Herakleios Konstantinos; 3 May 612 – c. May 641), often enumerated as Constantine III, was one of the shortest reigning Byzantine emperors, ruling for three months in 641. He was the eldest son of Emperor Heraclius and his first wife Eudokia.