Lakshmana Sena was the ruler of the Sena dynasty in Bengal when Ikhtiyar-Ud-Din Muhammad Khilji (Bakhtiyar Khilji) invaded and conquered Bengal around 1205 CE. Dharmapala and Sasanka ruled much earlier (Pala and pre-Pala periods), while Bhaskar Varman ruled Kamarupa (Assam), not Bengal.