Bhismaknagar (30 km from Roing) is the oldest archaeological and mythological site in Arunachal Pradesh, dates back to 12th century A.D. The fort was excavated during 1969-1973 which yielded terracotta plaques, decorative tiles, potteries, terracotta figurines etc. Popular legends and traditions identify the ruins of the fort as the site of the capital of Raja Bhismaka, father of Rumini (wife of Lord Krishna).