The manuscript is more of a biography,it's a veritable tome with a lot of detail 
But nevertheless it is a poem that was written by a famous French poet about the deeds of a man in a period of history when exageration and the twisting of a story to make a good yarn was very common.
Don't get me wrong, I'm not saying that it's all rubbish, far from it, it is an extremely valuable source.... it just has to be taken with a pinch of salt at times like many Medieval manuscripts of that type.
Darrell.