Crusader - Sacra Regna (ex name: Sed Doloris, Sed Sanguis) is a Mount & Blade Warband mod set in the Middle Ages, in the area called "the Holy Land". Now, as you arrive to the Middle-East during the crusades, three faiths crash for these lands: the Catholic, the Muslim and the Ortodox.
You MUST download this to play v.4 of Crusader - Sacra Regna correctly. Install: unzip it, then copy the map.txt into the MOD's folder and click yes when it asks for overwrite. After you've done this, you're ready to play :)