There is not an agreed definition on international law on what or who constitutes a minority. However, in democratic theory and positive law three categories of minorities are recognized: indigenous groups who were once hegemonic in their territory and who were displaced by the current state or its predecessor, other long-standing “national minority” groups who have long co-existed within the state, and new immigrant groups. This is not an exhaustive category list, because in some states some groups, like Roma, might not find their place within it.