 In the following three years, the Empire endured four short-lived emperors or usurpers before seventeen-year-old Constans II, grand-son of Heraclius, established himself on the throne of the diminished realm.In 643–644, Valentinus led a campaign against the Arabs, but his army was routed, he fled, and his treasury was captured.In 644 or 645, Valentinus attempted to usurp his son-in-law's throne.