This is the most medieval of MEDIEVAL: TOTAL WAR mods. Every province on the map is highly rebellious, and most of them are ridiculously, stupidly rebellious. The only way to survive is to play a conservative, careful game and hope for some luck.
This mod does create a more realistic, historical game than the original version- in my humble opinion. No super-power can blitzkrieg across the map of Europe (not without creating some giant rebellions). So the game tends to follow historical lines. You can get a crusade to Antioch at the start of the game-- if you're quick. Each crusader faction starts with a church so they can build a chapter house and send a crusade south right away. Antioch and Tripoli are remarkably un-rebellious. So once you get a crusade to those places, you stand a chance to create crusader states.
Some factions are VERY difficult (like the Holy Roman Empire). If you want a real challenge, play them.
To install:
Just unzip the file MOYA.TXT to the C:\Program Files\Total War\Medieval - Total War\campmap\startpos folder (or a different folder if you installed it differently!)
Enjoy! Just try playing as the Italians, Danes or Germans-- you will really want to pull your hair out! At least, you'll understand why Barbarossa jumped in that river!