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In page Udayagiri Caves:

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The archaeological excavation in the 1910s, however, yielded unexpected results in the form of buried inscriptions that confirmed that Vāsudeva and Bhagavatism (early forms of Vaishnavism) was influential by the 2nd century BCE and by linking the Udayagiri-Besnagar-Vidisha region politically and religiously to ancient Taxila.[6]