Marvelous idea, but what does that mean in the bigger picture? or is it just symbolism?
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Well, Master Chief and Cortana's is very similar in events to that of Ogier the Dane and his sword Curtana. Roland and Durendals tale I think was similar[I haven't read it in a while], so it could be a bit of a hunch that Joyuse might be some sort of weapon, or AI, or something left over from Charlamagne. All speculation built upon the relating symbolism, so take with some salt. XD