After the Arab conquest of Jerusalem in 638 the Muslim commander, Umar, had a temporary mosque built at the southern end of the Temple Mount. Umar’s mosque was replaced sixty years later when work began on the mosque of al-Aqsa, which was completed in 715. Al-Aqsa means ‘the farthest’ and was originally applied to the entire Temple Mount, being that farthest place where Mohammed ascended into Paradise according to an interpretation of Sum 17:1 in the Koran. Al-Aqsa, a basilica with a lead dome that shines silvery in the sun, became the great congregational mosque of Jerusalem, the place of Friday prayers and the midday sermon.
Fatimids, Ayyubids, Mamelukes, Ottomans and, since the 1920s, the Supreme Muslim Council have altered, extended or rebuilt the mosque, so that it is a palimpsest of thirteen centuries of architectural history. The Crusaders also played an important role. In 1099 it became the headquarters of the Crusader leader Godfrey of Bouillon, and for several years it served as a palace for Baldwin I, the first king of Jerusalem. The Crusaders called it the mosque of the Templum Solomonis because they believed that it stood on the site of Solomon’s Temple, so that when Baldwin gave the building to the new knighthood of the Poor Fellow-Soldiers of Christ in 1119 it was not long before they were calling themselves the Poor Fellow-Soldiers of Christ and of the Temple of Solomon-or, simply, the Templars.
Al-Aqsa was the Templars’ administrative, military and religious headquarters for over sixty years. They made various structural alterations and extensions to provide chambers for the Grand Master and other officers of the order and their staff, living quarters for the knights, and storage rooms for food, clothing and arms, but they took care not to damage the fine Arab decorations. Some Templar work survives, most notably the annexe they built to the east of the mosque which is now incorporated in the Women’s Mosque and the Islamic Museum, and they also left their mark on Solomon’s Stables.