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The end of Roman rule in Britain is the period during which the Roman Empire ended its relationship with Britain, thus marking the transition from Roman Britain to post-Roman Britain. No single date is correct without qualification, as Roman rule ended for different parts of Britain at different times, and under different circumstances. The year 410 is the preference of most historians. In that year, the Roman Emperor Honorius replied to a request for assistance with the ''Rescript of Honorius''. This told the Romano-Britons to see to their own defence, though it has been argued by some that this was actually sent to Bruttium in southern Italy due to the sporadicity of Zosimus' announcement of this in the middle of a section on Southern Italy.〔Zosimus VI, 10, 2〕 Some historians prefer 409 instead, the year when the Romano-Britons expelled Roman magistrates from their cities. The year 383 marks the end of Roman rule in northern and western Britain. In that year, Roman troops were withdrawn from those regions of Britain for the last time. ==Background== In the late 4th and early 5th centuries, the Roman Empire could no longer defend itself against either internal rebellion or the external threat posed by expanding Germanic tribes in northeastern Europe. This situation and its consequences governed the separation of Roman Britain from the rest of the Empire. In the late 4th century, the empire was controlled by members of a dynasty that included the Emperor Theodosius I. This family retained political power within itself and formed alliances by intermarriage with other dynasties, at the same time engaging in internecine power struggles and fighting off outside contenders (called "usurpers") attempting to replace the ruling dynasty with one of their own. These internal machinations drained the Empire of both military and civilian resources. The Empire's historical relationship with Germanic tribes was sometimes hostile, at other times cooperative, but ultimately fatal, as it was unable to prevent those tribes from assuming a dominant role in the relationship. By the late 4th century, the Western Roman Empire's military forces were dominated by Germanic troops, and Romanised Germans played a significant role in internal Roman politics. The Germanic tribes to the east of the Empire were able to take advantage of the Empire's weakened state, both to expand into Roman territory and, in some cases, to move their entire populations into lands once considered exclusively Roman. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「End of Roman rule in Britain」の詳細全文を読む スポンサード リンク
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