Sisupalgarh or Sisupalagada (Odia:[sisupaːl̪ɔɡɔɽɔ]ⓘ) is situated in Khurda District in Odisha, India, and houses ruined fortifications.[1] First inhabited around 7th to 6th centuries BCE,[2] it is one of the largest and best-preserved early historic fortifications in India, and was once the capital of ancient Kalinga. It is identified with Kalinganagara of Kharavela and Tosali of Ashoka.
^Smith, M.L. and R.K. Mohanty, (2016). "Archaeology at Sisupalgarh: The Chronology of An Early Historic Urban Centre in Eastern India", in Lefevre, Vincent, Aurore Didier and Benjamin Mutin (eds.), South Asian Archaeology and Art 2012, Volume 2, Brepols, Turhout, Belgium, p. 684: "In several areas we excavated to bedrock or to natural (virgin) soil, providing the opportunity to date the earliest occupations in those locations to the 6th to 7th centuries BCE."