The Crusaders attacked Jerusalem during the First Crusade in 1099 with the goal of reclaiming the city from Muslim control. They saw it as a holy mission to recapture the city where Jesus had lived and died. The capture of Jerusalem was a key objective in the Crusader's efforts to secure Christian control over important religious sites in the region.
He was ruling from Jerusalem when he died, so he probably died in his palace at Jerusalem.
Yes, he had a close friend who died during the capture of Asia.
The word 'crusade' derives from 'cross'. Jesus died on the cross, which is the basis for the Christian religion. Muslims had occupied the holy city of Jerusalem, therefore a pope made a call within western Christendom for a 'War of the Cross' or 'Crusade' to re-capture Jerusalem.
Camillo Jerusalem died in 1979.
Zamudas of Jerusalem died in 283.
Nectarius of Jerusalem died in 1680.
Elias of Jerusalem died in 516.
Matthias of Jerusalem died in 120.
Juvenal of Jerusalem died in 458.
Angelus of Jerusalem died in 1220.
Benedict I of Jerusalem died in 1980.