The Crusades an alternative view point
The overview of the crusades posted here is a bit like Klingon justice, a unique point of view.
In reality it was about land, power and money and getting rid of the trouble makers at home. In fact the Muslims seem to hold the moral high ground especially during the time of Saladin . Muslims even protected Christians from other Christians at times and were often more merciful in their treatment of captives though they could also be as cruel as the enemy.
Culturally I was predisposed to be on the side of the Crusaders, however after reading an excellent book (the cross & the crescent?) on the subject you cant help but have your sympathies with the Muslims. Saladin is essentially an Arab El Cid. Alternatively imagine an alternative Pony Wars(?) where the Native Americans ultimately drive the white man back into the sea.
The movie Kingdom of Heaven gives a good feel for the motivations of the two sides, though the actual story is fictional the events are accurate(as far as movies can be accurate) including the Horns of Hattin where you will see a Christian relic (the True Cross) carried to war, and the final siege of Jerusalem. The historical characters shown are however very much Hollywood versions.
Now this is a game and there is no need to slavishly try to follow history, we may even witness the bizarre sight of Vikings on Jerusalems streets, or a Byzantine Empire that reaches to the English Channel. A few things that are all too apparent to me are ...
Jerusalem is a drop off point for big VP items

Jerusalem is a VP location

Jerusalem is my capital
BTW anyone seen any barbarians recently?
GP and will be S this evening