Anthropologist Elman Service distinguishes two stages of tribal societies: simple societies organized by limited instances of social rank and prestige, and more stratified societies led by chieftains or tribal kings (chiefdoms). Historically, tribal societies represent an intermediate stage between the band society of the Paleolithic stage and civilization with centralized, super-regional government based in cities. Stratified tribal societies led by tribal kings thus flourished from the Neolithic stage into the Iron Age, albeit in competition with civilisations and empiresbeginning in the Bronze Age. An important source of information for tribal societies of the Iron Age is Greco-Roman ethnography, which describes tribal societies surrounding the urban, imperialist civilisation of the Hellenistic and Roman periods.
After the collapse of the Western Roman Empire, tribal kingdoms were again established over much of Europe in the wake of the Migration period. By the High Middle Ages, these had again coalesced into super-regional monarchies.
Tribal societies also remained prevalent in much of the New World, excepting Paleolithic or Mesolithic band societies in Oceania and in parts of Sub-Saharan Africa. Europeans forced centralized governments onto these societies during colonialism, but in some instances they have retained or regained partial self-government. (from Wiki)
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