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In page Kumbh Mela:

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The Kumbh Mela at Ujjain began in the 18th century, when the Maratha ruler Ranoji Shinde invited ascetics from Nashik to Ujjain for a local festival.[6] Like the priests at Prayag, those at Nashik and Ujjain, competing with other places for a sacred status, may have adopted the Kumbh tradition for their pre-existing Magha melas.[10]