The Old City of Jerusalem has within its walls holy places central to Judaism, Christianity and Islam. These include the Western Wall, built by King Solomon in the tenth century BCE as a retaining wall to support the Temple Mount; the Church of the Holy Sepulchre, commenced in the fourth century CE under the Emperor Constantine; and the Dome of the Rock and the Al Aqsa Mosque, built after the conquest of Jerusalem by the Caliph Omar in the seventh century. The proximity of these sites reflects the close historical and doctrinal relationship between the three monotheistic religions. hope this help :)