A free mod for Mount & Blade II: Bannerlord, by KYAN1TE.

A mod that reconstructs the kingdoms, cities, and characters to reflect a made-up post-Third Crusade scenario. The Holy Roman Empire wishes to begin the Fourth Crusade since Saladin has conquered Jerusalem. Which side will you support? Are you going to retake Jerusalem from the Ayyubids? Or are you going to aid Saladin in containing the Mongols?

With this mod, you can add a new map to your sandbox game, where you can build and craft your way to a great empire.

In this map, you will be playing the role of the Emperor of an empire. You have the ability to build your own cities, villages, castles, and even royal palaces.