salem from 679 to 688, the Mosque of Umar was a rectangular wooden structure built over ruins which could accommodate 3,000 worshipers. When the Muslims went to Bayt Al-Maqdes for the first time, They searched for the site of the Far Away Holy Mosque (Al-Masjed Al-Aqsa) that was mentioned in Quran and Hadith according to Islamic beliefs. Contemporary Arabic and Hebrew sources say the site was full of rubbish, and that Arabs and Jews cleaned it. The Umayyad caliph Abd al-Malik commissioned the construction of the Dome of the Rock in the late 7th century. The 10th century historian al-Muqaddasi writes that Abd al-Malik built the shrine in order to compete in grandeur with Jerusalem's monumental churches. Over the next four hundred years Jerusalem's prominence diminished as Arab powers in the region jockeyed for control. A messianic Karaite movement to gather in Jerusalem took place at the turn of the millennium, leading to a "Golden Age" of Karaite scholarship there, which was only terminated by the Crusades.
In 1099, The Fatimid ruler expelled the native Christian population before Jerusalem was conquered by the Crusaders, who massacred most of its Muslim and Jewish inhabitants when they took the solidly defended city by assault, after a period of siege, and left the city emptied of people; later the Crusaders created the Kingdom of Jerusalem. The city had been virtually emptied and recolonized by a variegated inflow of Greeks, Bulgarians, Hungarians, Georgians, Armenians, Syrians, Egyptians, Nestorians, Maronites, Jacobite Monophysites, Copts and others, to block the return of the surviving Muslims and Jews. The north-eastern quarter was repopulated with Eastern Christians from the Transjordan. As a result, by 1099 Jerusalem’s population had climbed back to some 30,000.
In 1187, the city was wrested from the Crusaders by Saladin who permitted Jews and Muslims to return and settle in the city. Under the terms of surrender, once ransomed, 60,000
