Mosque of the Elephant

The building, the only known mosque to have been built under al-Afdal's regency (1094–1021), was located south of Fustat (Old Cairo), on a hill above the so-called Lake of the Abyssinians (Birkat al-Habash).^{[1]: 168–169} It was built at a cost of 6,000 gold dinars and inaugurated in April/May 1105. Its name derived from a row of seven domed tombs in the vicinity, which from the distance is supposed to have looked like armed warriors riding on an elephant.^[1]: 169

In 1119, work began to install a new observatory at the mosque, in order to revise the astronomical tables (zij) used at the time in Egypt, that were hopelessly out of date. The affair turned into a fiasco: costs skyrocketed, especially for the large, and difficult to cast, bronze rings used for observations. Even when the latter were successfully cast and installed on the roof of the mosque, it turned out that the Muqattam Hills actually blocked the view of the sun during sunrise; the whole apparatus had to be transported to a new site on the Muqattam itself.^{[1]: 136–138}

The mosque was already ruined by the 14th century, when the Bedouin are recorded as watering their camels in its cistern.^[1]: 169

• Islam in Egypt
• List of mosques in Egypt