There's a mod called "Grell's First Crusade," made quite a long time ago by its namesake, Grell (who's not been active on these forums for many years. A while back, I had the good fortune of finding these mod files on Atomic Gamer and was pleasantly surprised by a very functional and engaging mod that adds several new factions (including Flanders) and which begins just after the first crusade. It's not that different from mods like BKB, XL and Medmod in scope, but it does have some neat features, such as recruitable Rabbis that are able to spread Judaism. Unfortunately, the files are no longer available on Atomic Gamer. Since I myself have them, I was wondering if I shouldgo about uploading them here, if anyone is interested. Thoughts?

You can find a brief description of the mod in this very old thread:

https://forums.totalwar.org/vb/showt...st-Crusade-mod

(In the thread, someone claims that the mod is buggy, but that hasn't been my experience (yet)).