Solomon's Stables was an underground vaulted space now used as a Muslim prayer hall at the bottom of stairs which lead down from the al-Aqsa Mosque, under the Temple Mount, to the base of the southern wall of the Temple Mount. Solomon's Stables are located under the southeastern corner of the Temple Mount, 12½ metres below the courtyard and feature twelve rows of pillars and arches. In December 1996 the Jerusalem Islamic Waq (an Islamic religious trust) converted the area into a prayer hall by adding lights and floor tiles, and renamed it the Marwani Prayer Hall.
The structure is most widely said to have been built by King Herod as part of his extension of the platform of the Temple Mount southward onto the Ophel. The Herodian engineers constructed the enormous platform as a series of vaulted arches in order to reduce pressure on the retaining walls. These vaults were originally storage areas of the Second Temple. A great deal of the original interior survives in the area of the Herodian staircases, although not in the area now renovated for use as a mosque. Visitors are rarely permitted to enter the areas with Herodian finishes.
The underground space for the most part remained empty except for the Crusaders period. The Crusaders converted it in 1099 into a stable for the cavalry. The rings for tethering horses can still be seen on some of the pillars. The structure has been called Solomon's Stables since Crusader times as a historical composite. 'Solomon's' refers to the First Temple built on the site, while the 'stables' refers to the functional usage of the space by the Crusaders in the time of Baldwin II (King of Jerusalem 1118-1131 CE).
References:The Gravensteen is a castle in Ghent originating from the Middle Ages. The name means 'castle of the counts' in Dutch. Arnulf I (918–965), Count of Flanders, was the first to fortify this place, building a medieval bastion on this high sand dune, naturally protected by the river Leie and its marshy banks. This bastion consisted of a central wooden building and several surrounding buildings, also in wood.
In the early 11th century, the wooden building was replaced by a stone residence, consisting of three large halls that made up three storeys, connected by a stone stairwell. The monumental stone staircase, the light openings, the fireplaces built into the walls and the latrines were signs of considerable luxury and comfort in those days. There was probably also a tower.