In what ways did the Crusades affect Jerusalem?

One effect of the Crusades was the creation of a new hero for the Islamic world: Saladin, the Kurdish sultan of Syria and Egypt, who in 1187 freed Jerusalem from the Christians but refused to massacre them as the Christians had done to the city's Muslim and Jewish citizens 90 years previously.

Explanation:

The Crusades were organized by western European Christians after centuries of Muslim wars of expansion. Their primary objectives were to stop the expansion of Muslim states, to reclaim for Christianity the Holy Land in the Middle East, and to recapture territories that had formerly been Christian.

Effects of the Crusades. Although the crusades failed to capture Jerusalem, they had several major impacts on Western Europe. They increased the authority of the king: Sometimes nobles died in battle without leaving an heir in which case the king got their land. Kings passed taxes to pay for the crusades.

I used multiple sources to get this answer this is a summarization