When the peoples of the north coast of Java adopted Islam is unclear. Chinese Muslim, Ma Huan and envoy of the Yongle Emperor of China,[1] visited the Java coast in 1416 and reported in his book, Ying-yai Sheng-lan: The overall survey of the ocean's shores' (1433), that there were only three types of people in Java: Muslims from the west, Chinese (some Muslim) and the heathen Javanese.[21] Since the east Javan gravestones were those of Javanese Muslims fifty years before, Ma Huan's report indicates that Islam may have indeed been adopted by Javanese courtiers before the coastal Javanese.