memorial stones appear in two forms – viragal (hero stone) and satigal (sati stone), each to memorialise something different. Both of these are found in many regions of India, but "rarely if ever earlier in date than the 8th or 9th century". Numerous memorial sati stones appear 11th-century onwards, states Michaels, and the largest collections are found in Rajasthan. There have been few instances of sati in the Chola Empire in South India. Vanavan Mahadevi, the mother of Rajaraja Chola I (10th century) and Viramahadevi the queen of Rajendra Chola I (11th century) both committed Sati upon their husband's death by ascending the pyre. The 510 CE inscription at Eran mentioning the wife of Goparaja, a vassal of Bhanugupta, burning herself on her husband's pyre is considered to be a Sati stone. Practice in Hindu-influenced cultures outside India The early 14th-century CE traveller of Pordenone mentions wife burning in Zampa (Champa), in nowadays south/central Vietnam. Anant Altekar states that sati spread with Hindu migrants to Southeast Asian islands, such as to Java, Sumatra and Bali. According to Dutch colonial records, this was however a rare practice in Indonesia, one found in royal households. In Cambodia, both the lords and the wives of a dead king voluntarily burnt themselves in the 15th and 16th centuries. According to European traveller accounts, in 15th century Mergui, in present-day extreme south Myanmar, widow burning was practised. A Chinese pilgrim from the 15th century seems to attest the practice on islands called Ma-i-tung and Ma-i (possibly Belitung (outside Sumatra) and Northern Philippines, respectively). According to the historian K.M. de Silva, Christian missionaries in Sri Lanka with a substantial Hindu minority population, reported "there were no glaring social evils associated with the indigenous religions-no sati, (...). There was thus less scope for the social reformer." However, although sati was non-existent in the colonial era, earlier Muslim travellers such as Sulaiman al-Tajir reported that sati was optionally practised, which a widow could choose to undertake. Mughal Empire (1526–1857) Ambivalence of Mughal rulers According to Annemarie Schimmel, the Mughal Emperor Akbar (r.1556–1605) was averse to the practice of Sati; however, he expressed his admiration for "widows who wished to be cremated with their deceased husbands". He was averse to abuse, and in 1582, Akbar issued an order to prevent any use of compulsion in sati. According to M. Reza Pirbhai, a professor of South Asian and World history,