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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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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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.