"After the Delhi Sultanate had been set up, India found itself within the cultural orbit of the so-called Moslem world. The ideas of Islam started to penetrate Sind in the seventh century and other parts of Northern India in the ninth century. But in the Delhi Sultanate Islam was made the state religion that was foisted upon the local population by force. Various sections of the Hindu population adopted the new religion, a small part under force and others because of the privileges to which it gave them access, since only Moslems were able to hold prominent posts. A third group took this step in order not to pay the jizya or poll-tax on non-Moslems, while members of the lower castes did so in the hope of avoiding the disadvantages attendant on their status."