History In antiquity In a historical sense, statelessness could reasonably be considered to be the default human condition that existed universally from the evolution of human species to the emergence of the first human civilizations. Historically in every inhabited region on Earth, prior the emergence of states as polities humans organized into tribal groups. In the absence of written laws, people living in tribal settings were typically expected to adhere to tribal customs and owed allegiance to their tribe and/or tribal leaders. As states began to form, a distinction developed between those who had some form of legal attachment to a more complex polity recognized to be a state in contrast to those who did not. The latter, often living in tribes and in regions not yet organized into and/or conquered by more powerful states, would widely be considered to be stateless in a modern sense. Historically, there is considerable correlation between those who would meet the modern definition of statelessness and those the contemporary ruling classes of the extant states would have deemed to be mere barbarians. However, civilizations of this period more often distinguished between a subject and a slave as opposed to between a citizen and a subject. In many monarchies, the concept of citizenship as something distinct from that of a subject did not exist – people under a monarch's rule who were considered subjects typically enjoyed more rights than a slave, and would presumably not have been considered "stateless" by the monarch. But even slaves in a monarchical state were often considered to have a legal status more desirable, at least from the perspective of the ruler, compared to those living outside the frontiers in tribal settings who were typically regarded as barbarians. Depending on the circumstances, a monarch seeking to conquer a frontier region would seek to either subjugate or enslave the inhabitants, but either would impart on the conquered population a change from stateless barbarian to some form of legal status in which allegiance and/or obedience to the ruler could be expected. With the emergence of the concept of citizenship in the Greco-Roman world, the status of slaves and inhabitants of conquered territories during Classical antiquity became in some ways analogous to contemporary statelessness. In antiquity, such "statelessness" affected captive and subject populations denied full citizenship, including those enslaved (e.g., conquered populations excluded from Roman citizenship, such as the Gauls immediately following the