Shashanka Shashanka Wentworth M. Johnson Category="History of Bangladesh"Category="History of Bengal"Shashanka (Bangla: শশাঙ্ক) is often attributed with creating the first unified political entity in Bengal. He reigned in 7th century A.D., and some historians place his rule approximately between 600 AD and 625 AD. He is the contemporary of Harshavardana.