Jagat Singh II
Maharana Jagat Singh II succeeded his father Sangram Singh II, reviving the triple alliance of Mewar, Marwar and Amber which was initiated by his grandfather Maharana Amar Singh II. With the declining Mughal Empire, the union of states was formed to gain independence and expand Rajasthan, making them quite powerful at the time. Maharana Jagat Singh II played a prominent role in the union of Rajput forces at Harda conference in July 1734 and was given the authority to head the alliance. But with the upsurge of independent ambitions amongst the Rajputana rulers, the alliance failed leading to the down slide of Rajputana.
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Source: Wikipedia