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In page Humayun:

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After Timur's death, his territories were divided among Pir Muhammad, Miran Shah, Khalil Sultan and Shah Rukh, which resulted in inter-family warfare.[5] Not all umarah (nobles) viewed Humayun as Babur's rightful successor. While Babur was still alive, some of the nobles tried unsuccessfully to install his brother-in-law, Mahdi Khwaja, as ruler.[6] Upon Babur's death, Humayun's territories were the least secure[citation needed]