Sena Dynasty ruled Bengal for over a century (1097-1225). The Sena dynasty replaced the Palas in Bengal towards the close of the 11th century AD. The Sena period in Bengal constituted an important part in the history of ancient India. The origin of the Senas though is not known definitely, yet it is clear that the Senas were the Kshatriyas by origin. The rule of the Senas in Bengal is usually connected with the emergence of orthodox Hinduism in a Hindu-Buddhist society. The Senas uprooted the weak Pala power in Bengal and captured the suzerainty. Initially the Sena power existed as a petty power in a small area. The Sena ascendancy was witnessed from the time of Vijayasena. Under his long reign of 60 years, the Sena power was extended to a vast extent. The Sena Empire constituted of Bengal and the adjoining parts under Vijayasena. The legacy of the glorious reign of Vijayasena was carried out by his son Vallalsena. The reign of Vallalsena was mainly noted for peace and social reform. Vallalsena conquered the territories of Magadha and Mithila and consolidated the kingdoms conquered by his father. He was a patron of art and culture. His reign was marked with cultural resurgence. Lakshmanasena succeeded his father Vallalsena in 1179 AD. He was not a great conqueror like his predecessors. Moreover his inefficient administration brought down the downfall of the Sena supremacy. At the closing of his reign, the Turkish invasion led by Bakhtiyar Khalji shattered the foundation of the Sena kings in Bengal.