In 2017 bricks dated to mature Harappan period were discovered from the outskirts of the ancient city of Vaishali. Any in depth research which may establish definite links between Indus Valley Civilization and Bihar is yet to be conducted. A round seal excavated from Vaishali dated 200 BC-200 AD has three inscribed letters which according to Indus Valley Civilization scholar Iravatham Mahadevan represents formulas inscribed on the Indus seals and dates it to the earliest layers of excavation i-e 1100 BC.