Religious orthodoxy would only play an important role during the reign of Shah Jahan's son and successor, Aurangzeb, a devout Sunni Muslim. Aurangzeb was comparatively less tolerant of other faiths than his predecessors had been; and has been subject to controversy and criticism for his policies that abandoned his predecessors' legacy of pluralism, citing his introduction of the jizya tax, doubling of custom duties on Hindus while abolishing it for Muslims, destruction of Hindu temples, forbidding construction and repairs of some non-Muslim temples, and the executions of Maratha ruler Sambhaji and the ninth Sikh guru, Guru Tegh Bahadur, and his reign saw an increase in the number and importance of Islamic institutions and scholars. He led many military campaigns against the remaining non-Muslim powers of the Indian subcontinent – the Sikh states of Punjab, the last independent Hindu Rajputs and the Maratha rebels – as also against the Shia Muslim kingdoms of the Deccan. He also virtually stamped out, from his empire, open proselytisation of Hindus and Muslims by foreign Christian missionaries, who remained successfully active, however, in the adjoining regions: the present day Kerala, Tamil Nadu and Goa. The Hindus in Konkan were helped by Marathas, Hindus in Punjab, Kashmir and North India were helped by Sikhs and Hindus in Rajasthan and Central India were helped by Rajputs.