The autocephalous and autonomous Orthodox churches are those churches which have self-government. These churches also constitute what is generally known simply as the Orthodox Church, but may also be referred to as the mainstream Orthodox Church or world Orthodoxy. They all recognize one another and are in full communion with each other. That they constitute the "mainstream" (i.e., that they are legitimately and/or exclusively Orthodox) is disputed by a number of groups with whom they are not in communion, such as most of the Old Calendarists.