Ruknuddin Firuz
Rukn-ud-din Firuz (), also transliterated as Rukn al-Din Firoz (died 19 November 1236), was a ruler of Delhi sultanate for less than seven months in 1236. As a prince, he had administered the Badaun and Lahore provinces of the Sultanate. He ascended the throne after the death of his father Iltutmish, a powerful Mamluk ruler who had established the Sultanate as the most powerful kingdom in northern India. However, Ruknuddin spent his time in pursuing pleasure, and left his mother Shah Turkan in control of the administration. The misadministration led to rebellions against Ruknuddin and his mother, both of whom were arrested and imprisoned. The nobles and the army subsequently appointed his half-sister Razia on the throne. Early life 

Ruknuddin was born to the Delhi Sultan Iltutmish and his wife Khudawanda-i-Jahan Shah Turkan, who was a hand-maid of Turkic origin. As a prince, he was assigned the iqta' of Badaun in 1228. He administered Badaun with the support of Ainul Mulk Husain Ash'ari, a former minister of Iltutmish's rival Nasir ad-Din Qabacha. Iltutmish had groomed his eldest son Nasiruddin Mahmud to be his successor, but this son died unexpectedly in 1229. While leaving for his Gwalior campaign in 1231, Iltutmish left his daughter Razia as the in-charge of Delhi's administration. Razia handled the administration well, and when Iltutmish returned, he ordered preparation of a decree naming Razia as his heir apparent, despite opposition from the orthodox nobles. Iltutmish declared that his surviving sons were absorbed in pleasurable activities, and were incapable of managing the state affairs after his death. However, shortly before his death, Iltutmish appears to have agreed to appoint Ruknuddin - a son - as his successor. In 1233, he appointed Ruknuddin as the administrator of Lahore. During his last days, when he had become seriously ill, he recalled Ruknuddin from Lahore to Delhi, and Ruknuddin was unanimously accepted as his successor by the nobles. Reign 

After the death of his father Iltutmish, Ruknuddin ascended the throne in April–May 1236. Saifuddin Hasan Qarlugh, who assumed that the Delhi Sultanate would be weakened after Iltutmish's death, invaded India around this time. However, Saifuddin Aibak - a Turkic slave officer appointed as the governor of Uch by Iltutmish, defeated him and forced him to retreat. Minhaj praises Ruknuddin for three qualities: handsomeness, gentle temperament, and generous nature. According to Minhaj, Ruknuddin greatly enjoyed riding elephants, and greatly favoured mahouts, who became important in his court. Minhaj narrates that Ruknuddin would scatter gold coins in bazaars, while riding intoxicated on an elephant. He used to spend a lot of money on musicians, clowns, and eunuchs. While spending his time and the state funds in pursuing pleasure, Ruknuddin left the control of administration to his mother Shah Turkan. Rebellions 

Shah Turkan was originally reputed for charitable and religious donations, but her nature changed after she gained control of the administration. She mistreated ladies in Iltutmish's harem, and according to Minhaj, "destroyed" several of them. She and Ruknuddin ordered the blinding and killing of Qutubuddin, a young and popular son of Iltutmish, which triggered several rebellions:

 In the Awadh region, Malik Ghiyasuddin Muhammad Shah - a son of Iltutmish - rebelled against Ruknuddin. He sacked several towns, and plundered the treasure of Lakhnauti, which was being transferred to Delhi. Malik Izzuddin Muhammad Salari, who now held the iqta' of Badaun, also rebelled. Three other iqta-holding nobles collectively rebelled against Ruknuddin: Malik Izzuddin Kabir Khan Ayaz (Multan), Malik Saifuddin Kuchi (Hansi), Malik Alauddin Jani (Lahore). Ruknuddin sent an army against the rebels, but his wazir (prime minister) Nizamul Mulk Junaidi deserted the army at Kailugarhi, and fled to Koil (modern Aligarh), later joining Salari. The forces of Junaidi and Salari subsequently joined the forces of Kuchi and Jani. Massacre of Tazik officers 

The officers of Ruknuddin's father Iltutmish belonged to two major categories: the Turkic-origin slaves and the Tazik-origin non-slaves. The Tazik officers included the prime minister Junaidi. After the rebellions against Ruknuddin, the Turkic officers, who formed the core of Ruknuddin's army, planned murders of many Tazik officers in the Mansurpur-Tarain region. Several important Tazik officers were killed as a result:

 Tajul Mulk Mahmud, dabir
 the son of mushrif-i mamalik
 Bahauddin Hasan Ash'ari
 Karimuddin Zahid
 Ziyal Mulk, the son of Junaidi
 Nizamuddin Shafurqani
 Khwaja Rashiduddin Malikani
 Amir Fakhruddin, dabir
 Bahram Shah, dizdar

Imprisonment and death 

Ruknuddin marched towards Kuhram to fight the rebels. Meanwhile, in Delhi, his half-sister Razia - whom his mother Shah Turkan had planned to execute - instigated the general public against Shah Turkan at a congregational prayer. A mob then attacked the royal palace and detained Shah Turkan. Several nobles and the army pledged allegiance to Razia, and placed her on the throne. Ruknuddin marched back to Delhi, but Razia sent a force to arrest him: he was imprisoned and probably executed on 19 November 1236, having ruled for 6 months and 28 days. 