After the decline of the Palas, the Sena dynasty established its rule in Bengal. The founder of the dynasty was Samantasena . The greatest ruler of the dynasty was Vijaysena . He conquered the whole of Bengal and was succeeded by his son Ballalasena . He reigned peacefully but kept his dominions intact. He was a great scholar and wrote four works including one on astronomy. The last ruler of this dynasty was Lakshamanasena under whose reign the Muslims invaded Bengal, and the empire fell.