well, I am quite certain this is way off, but here is what I got.
And it is enough for the king for the single flag to wave through the thin gusts, woven from a simple cendal, (made) of a splendid bramble, ??? Just as the Letanian people are accustomed???, from a custom in the settled days. Since a golden flame may commonly have the name ?cugranem?, in every war it has all the flags to _______ ?preo?
I think it’s something about the banner of st Denis.
I know that is way off, particularly because some of those words do not exist in my Latin dictionary. Also, there is a lot of ambiguity and some of these things could be translated very differently. If there are any macrons (long marks) in the original you should post those, because they can change the meaning dramatically. I know they don’t show up in a lot of original Latin writings though.