The Empire Overrun by Persians and Greeks
The flourishing period of the Eastern Empire closes for a long time with Heraclius, who died in A.D. 641. The Persians and the Turks (Mongolians from Asia), with their kinsmen the Avars attacked the empire with formidable strength. Between 611 and 615 the Persians overran Egypt, Syria and Asia Minor, remaining encamped for ten years within sight of Constantinople. Heraclius, between 620 and 628, recovered the Persian conquests.