I would guess you would have to define what you mean by "evolved"
As far as historical accuracy You have to consider that much of what is written about any historical event is colored by the perspective of the writer. By the way I have no idea what's accurate or not accurate in the movie, I just enjoyed the fact that it was not all about trying to obliterate the other side and illustrated that the crusades were not all about fighting for christianity so to speak and that some of the Crusaders were there for their own gain.
