Despite being one of the most significant developments in Indonesian history, historical evidence is fragmentary and uninformative. Understanding the coming of Islam to Indonesia is limited; there is considerable debate amongst scholars about what conclusions can be drawn about the conversion of Indonesian peoples. The primary evidence, at least of the earlier stages of the process, are gravestones and a few travelers' accounts, but these can only show that indigenous Muslims were in a certain place at a certain time. This evidence is insufficient to comprehensively explain more complicated matters such as how lifestyles were affected by the new religion or how deeply it affected societies.