 Complete the following phrase:  The history of Jerusalem during the Middle Ages is generally one of decline; beginning as a major city in the Byzantine Empire, Jerusalem prospered during the early centuries of Muslim control 63738969, but under the rule of the Fatimid caliphate late 10th to 11th centuries its population declined from about 200,000 to less than half that number by the time of the Christian conquest in 1099. The Christians 