Flavius Heraclius Constantinus Augustus (Greek: Φλάβιος Ηράκλειος Κωνσταντίνος Αύγουστος), known as Constans II, was Roman Emperor from AD 641 to 668. The grandson of Heraclius I, he succeeded the latter after a period of civil strife during which several emperors, including Constan's father Constantine III, took the throne and were soon overthrown. Constans II became sole emperor at the age of 11 and initially ruled through a regency led by Paul II, Patriarch of Constantinople, and the general Valentinus.