In a major historic significance to the temple development, Srisailam authorities have unearthed 18 copper plates dating back to the 14th century or earlier, during excavations at Ghanta Matham in Srisailam.

Out of 6 copper plate sets, 4 sets are written in Sanskrit language and Nandi-Nāgarī script and other 2 plates are in Telugu language and script. All the plates can be assigned between 14th-16th century C.E..

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