It is believed that the central grave is that of Firoz Shah .
The two similar ones are probably those of Firoz Shah 's son , Nasir ud din Mahmud , and grandson , Ala - ud - din Sikandar Shah .
It is believed that the central grave is that of Firoz Shah , and the two similar ones are probably those of his son , Nasir ud din Mahmud , and grandson , Ala - ud - din Sikandar Shah .