Answer: Broke his neck after falling down the stairs
Notes: Humayun has it that the monarch was on top of his library, in the observatory looking out at the sky, when he is supposed to have spotted the transit of Venus across the Sun, and in his excitement to share his discovery with others, he tripped, fell down the stairs and broke his neck. Humayun was succeeded by his son, Akbar, easily one of India's greatest rulers.
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