Various explanations exist for how these territorial units may have formed in the 5th and 6th centuries. The first elements in names ending in
-ingas have often been interpreted as personal names, and the territories have often been seen as the areas settled by families or tribes led by those named individuals, or perhaps with them as their earliest known common ancestor. This view sees
regiones as the areas of previously autonomous tribal groupings, that retained their identity when absorbed into larger kingdoms in the later 6th and 7th centuries, coming to pay tribute to a king rather than an earlier tribal chieftain. Alternatively
regiones may have formed from earlier units based around centres such as
hillforts in the aftermath of the
end of Roman rule in Britain, subsequently transferred to Anglo-Saxon rulers. Some
regiones carry evidence of continuity with earlier Roman or pre-Roman subdivisions, including that of the
Brahhingas, which was based around
Braughing in modern
Hertfordshire, the site of both an earlier
Iron Age oppidum and a large Roman town. This would suggest that
regiones succeeded the Roman subdivisions of
civitates known as
pagi. Many small shires have been identified in the area of the south east of modern
Scotland that was under
Northumbrian control during the early medieval period, but many with identical features have also been identified north of the
River Forth in areas that were never under Anglo-Saxon or Roman rule, suggesting that the territories may have even earlier
Celtic origins. ==Structure and role==