Any historical sources for that? The alleged letter from Khosrau was: > Khosrow, greatest of Gods, and master of the earth, to Heraclius, his vile and insensat

Any historical sources for that? The alleged letter from Khosrau was: > Khosrow, greatest of Gods, and master of the earth, to Heraclius, his vile and insensate slave. Why do you still refuse to submit to our rule, and call yourself a king? Have I not destroyed the Greeks? You say that you trust in your God. Why has he not delivered out of my hand Caesarea, Jerusalem, and Alexandria? And shall I not also destroy Constantinople? But I will pardon your faults if you submit to me, and come hither with your wife and children; and I will give you lands, vineyards, and olive groves, and look upon you with a kindly aspect. Do not deceive yourself with vain hope in that Christ, who was not able to save himself from the Jews, who killed him by nailing him to a cross. Even if you take refuge in the depths of the sea, I will stretch out my hand and take you, whether you will or no But its authenticity is doubtful. Also AFAIK we don’t have any evidence about Heraclius trying to surrender. I mean.. how would that even work? He would have been just overthrown immediately.