<Li> Surajkund (Anangpur), Tomar city dating from the 9th or 10th century, where a large masonry tank can be found . </Li> <Li> Lalkot, built ca . 1052 A.D. by the Tomara ruler, Anangpal . In ca . 1180 A.D. Prithviraj Chauhan extended and fortified it as a defence against invaders; the city then became known as Qila Rai Pithora . This area, now called as Mehrauli, was also the seat of the Mamluk (Slave) dynasty . </Li> <Li> Siri, first established as a camp for protection against invading Mongols by Alauddin Khalji, and fortified in about ca . 1303 A.D. </Li> <Li> Tughluqabad, built by Ghiyasuddin Tughluq in ca . 1320 A.D. A subsidiary fort Adilabad was built by his son Muhammad bin Tughlaq in ca . 1325 A.D. </Li>

Who lived in delhi before delhi sultans occupied it