The correct chronological order of their reigns is: Iltutmish (1211-1236), Rukn-ud-din Firuz (1236), Nasir-ud-din Mahmud (1246-1266), and Muiz-ud-din Kaiqabad (1287-1290). Iltutmish was one of the most influential Sultans, solidifying the Sultanate's rule. Rukn-ud-din Firuz's short and ineffective reign was followed by the pious Nasir-ud-din Mahmud. Lastly, Muiz-ud-din Kaiqabad ruled briefly before the transition to the Khalji Dynasty.
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