In 610, Heraclius,revolted against Phocas and killed him, crowning himself as Emperor of the Byzantine Empire. He then tried to negotiate peace with Khosrow II by sending diplomats to his court. Khosrow, however, rejected their offer and said: "That kingdom belongs to me, and I shall enthrone Maurice's son, Theodosius, as emperor. for Heraclius, he went and took the rule without our order and now offers us our own treasure as gifts. But I shall not stop until I have him in my hands." Khosrow then had the diplomats executed.