When did religious equality or equality amongreligions appear according to a historical perspective as wellas an academic concept? In my opinion, there has not beenany valuable work about this topic in Vietnam. If there is nota specific definition or concept of religious equality, where is“this term” hidden? When did it appear? What political,economic, cultural, social and religious conditions lead to theemergence of the concept of religious equality? In particular,this article indicates process and concept of religiousequality