Knowra Roman withdrawal from Britain Roman withdrawal from Britain The early fifth-century end of Roman political and military control over Britain, as imperial troops and officials departed amid pressures elsewhere in the empire.
Honorius's Rescript to Britain : A passage in Zosimus describing Emperor Honorius telling British communities to provide for their own defense. It is the clearest surviving sign that imperial protection had been withdrawn by the early fifth century.
Roman usurpers in Britain : Usurpers proclaimed by Roman forces in Britain, including Carausius, Allectus, and Constantine III. Repeated bids for imperial power show how Britain’s armies became entangled in crises beyond the island.
Sub-Roman Britain : The period and societies in Britain after Roman imperial government ended, before stable early medieval kingdoms emerged. It names the fragmented political world that followed the withdrawal.
Rescript of Honorius : The reported imperial instruction, preserved by Zosimus, that told Britain to look after its own defense. Scholars debate whether it marks formal abandonment, a temporary instruction, or a mislocated event.
Constantine III : A Roman usurper proclaimed emperor in Britain in 407 who crossed to Gaul with troops and was later defeated. His departure carried mobile forces from Britain during the empire's western crisis.
Magnus Maximus : A Roman general proclaimed emperor in Britain in 383 who crossed to Gaul with troops and was executed in 388. His expedition had already removed soldiers from Britain decades before the final imperial withdrawal.
Anglo-Saxon settlement of Britain : The establishment of Anglo-Saxon communities and kingdoms in Britain from the fifth century onward. The collapse of Roman authority preceded the expansion of these new political communities.
Zosimus : A Greek historian of the early sixth century whose New History preserves accounts of the late Roman Empire. His compressed passage is central to debates about when and how Britain lost imperial protection.
Saxon settlement of Britain : The migration and settlement of Germanic-speaking peoples in Britain, especially from the fifth century onward. Post-Roman communities increasingly relied on local military arrangements, including recruitment of Saxon fighters.
Roman military in Britain : The legions, auxiliary units, and frontier forces stationed in Roman Britain. Their gradual redeployment and loss of imperial supply made provincial defense increasingly difficult.
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