Trying not be overly pedantic, jno, but I'm sure you know that Jerusalem was actually taken over by the Muslims around 638 BC. A period of about 500 years passed with relative calm and peace in the area until the triggering event of Fatimid Caliph al-Hakim ordering the destruction of over two thousand Christian churches in the area, including the Chruch of the Holy Sepulchre in A.D. 1009. Events in Europe, most notably Spain, played a large part in the decision to launch the First Crusade in 1095 culminating in the re-capture of Jerusalem in 1099... lasting only about 90 years...