The eighth Sultan was Nasiruddin Mahmud (), who had the titular name of "Nasir-ud-din Feroze Shah" () and reigned from 1246 to 1266. As a ruler, Mahmud was known to be very religious, spending most of his time in prayer and was renowned for aiding the poor and the distressed. It was his Deputy Sultan, Ghiyath-ud-din Balban, who primarily dealt with state affairs. The ninth Sultan was Ghiyath-ud-din Balban (), who had the titular name of "Sultan" and reigned from 1266 to 1287. Balban ruled with an iron fist and broke up the Chihalgani group of noblemen. He tried to establish peace and order in India and built many outposts with garrisons of soldiers in areas where there had been disorder. Balban wanted to make sure everyone was loyal to the crown, so he established an efficient espionage system. The tenth and final Sultan was Muiz-ud-din Muhammad Qaiqabad (), who had the titular name of "Sultan" and reigned from 1287 to 1290. Being still young at the time, he ignored all state affairs. After four years, he suffered a paralytic stroke and was later murdered in 1290 by a Khalji chief. His three-year-old son Kayumars nominally succeeded him, but the Slave dynasty had ended with the rise of the Khaljis. The architectural legacy of the dynasty includes the Qutb Minar by Qutb ud-Din Aibak in Mehrauli, the Mausoleum of Prince Nasiru'd-Din Mahmud, eldest son of Iltumish, known as "Sultan Ghari" near Vasant Kunj, the first Islamic Mausoleum (tomb) built in 1231, and Balban's tomb, in the Mehrauli Archaeological Park.