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Not who you're looking for? Others named Jean de Joinville: French chronicler
“Whenever our sainted king heard that they were throwing the Greek fire at us, he rose, in his bed, and stretching out his hands towards our Lord, exclaimed with tears, "O! gracious God, (Biau Sire Diex,) preserve my people to me."”
“The good count of Soissons laughed at me, saying, "Seneschal, let this rabble hoot, as by God's coif (this was his usual oath) we shall live to speak of this day in ladies' chambers."”
“There, where I was on foot with my knights, the king came, wounded, with all his battle, and with great sound and noise of trumpets and nakirs, and halted on a raised way; but never was so goodly a man at arms seen, for he topped all his people from the shoulders upward, and had a golden helm on his head, and a German sword in his hand.”
“When the Old Man rode forth, he was preceded by a crier who bore a Danish axe with a long handle, all covered with silver, and stuck full of daggers, who proclaimed, "Turn from before him who bears the death of kings in his hands."”
Quotes via Wikiquote (CC BY-SA), each with its original source.