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In page Indrabhishek:

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Some historians attribute the need for the coronation to resentment by the other Maratha Deccan nobles of Shivaji's success (he being a Bhosale) and his taking a higher seat than them at state dinners.[1] Shivaji claimed he was of the line of Vishwamitra in his dānapātra (donation).[2] Late nineteenth century theories are not valid.