Ghiyasuddin Bahadur Shah I was the son and successor of Sultan Shamsuddin Firoz Shah of the Bengal kingdom of Lakhnauti.
Kaikaus was a younger brother of Kaikobad and hence, if Firoz was a younger brother of Kaikaus, he would be in his mid-thirties at the time of his accession to the throne of Lakhnauti in 1301 AD.
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13th century scholar, Amir Khusrow, mentioned the names of two sons of Bughra Khan - Qaiqabad and Rukunuddin Kaikaus but he did not mention the name of Shamsuddin Firoz.
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Similarly, the conquest of Satgaon, begun during the time of Kaikaus under his general Zafar Khan, was completed during the time of Firoz Shah.
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Moreover, Sultan Ghiyasuddin Balban, following the Iranian tradition, named his grandsons as Kaikobad, Kaikaus, Kaikhusrau, Kaimurs etc.
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Furthermore, Kaikobad was only 19 at the time of his accession to the throne of Delhi in 1288 AD.
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Probably Firoz Iitigin, one of the two Firozes, after the death of Rukunuddin Kaikaus or displacing him forcibly, came to the throne of Lakhnauti in 1301 CE with the title of Sultan Shamsuddin Firoz Shah.
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Rukunuddin Kaikaus had already started the conquest of the eastern part of Bengal, and the task was completed during the time of Firoz Shah.
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It is said that Kaikaus issued coins for the first time from the Kharaj of Bang.
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