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In page History of Bangladesh:

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Khiljis were Turko Afghan.[2][4][5] The period after Bakhtiar Khilji's death in 1207 involved infighting among the Khiljis. This was typical of a pattern of succession struggles and intra-sultanate intrigues during later Turko Afghan regimes.[1] In this case, Ghiyasuddin Iwaj Khilji prevailed and extended the Sultan's domain south to Jessore and made the eastern Bang province a tributary. The capital was established at Lakhnauti on the Ganges near the older Bengal capital of Gaur. He managed to make Kamarupa and Trihut pay tribute to him. But he was later defeated by Shams-ud-Din Iltutmish.[citation needed]