Siri Fort, in the city of New Delhi, was built during the rule of Ala-ud-Din Khalji of the Delhi Sultanate to defend the city from the onslaught of the Mongols. It was the second of the seven cities of medieval Delhi built around 1303 (stated to be the first entirely constructed by Muslims), which at present is seen only in ruins with a few remnants (pictured) Near the Siri Fort ruins modern auditoriums, the Asiad Games Village Complex and residential and commercial establishments fill the modern landscape between the Khel Gaon Marg and the Aurobindo Marg in the heart of South Delhi.