The Archaeological Survey of India (ASI) discovered ancient Buddhist artifacts, including a Buddha head and inscribed relics, at Odisha’s Ratnagiri. Ratnagiri has been associated with Buddhism since Emperor Ashoka's invasion of Kalinga. It was a significant center for Mahayana and Tantrayana (Vajrayana) Buddhist learning, rivaling Nalanda. Ratnagiri, along with Lalitagiri and Udayagiri, forms the Diamond Triangle of Buddhist centers in Odisha.
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