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The territory of modern Switzerland was a part of the Roman Republic and Empire for a period of about six centuries, beginning with the step-by-step conquest of the area by Roman armies from the 2nd century BC and ending with the decline of the Western Roman Empire in the 5th century AD. The mostly Celtic tribes of the area were subjugated by successive Roman campaigns aimed at control of the strategic routes from Italy across the Alps to the Rhine and into Gaul, most importantly by Julius Caesar's defeat of the largest tribal group, the Helvetii, in 58 BC. Under the ''Pax Romana'', the area was smoothly integrated into the prospering Empire, and its population assimilated into the wider Gallo-Roman culture by the 2nd century AD, as the Romans enlisted the native aristocracy to engage in local government, built a network of roads connecting their newly established colonial cities and divided up the area among the Roman provinces. Roman civilization began to retreat from Swiss territory when it became a border region again after the Crisis of the Third Century. Roman control of most of Switzerland ceased in 401 AD, after which the area began to be occupied by Germanic peoples. ==Switzerland prior to the Roman conquest== (詳細はSwiss plateau, within the natural borders of the Alps to the South and East, Lake Geneva and the Rhône to the west and the Rhine to the north, was recognized as a contiguous territory by Julius Caesar. This area had been dominated by the La Tène culture since the 5th century BC, settled by a mostly Celtic population (Gauls), of which the five tribes of the Helvetii were the most numerous, but which also included the Rauraci in north-west Switzerland centered on Basel, the Allobroges around Geneva. South of the Swiss plateau were the Nantuates, Seduni and Veragri in the Valais, the Lepontii in the Ticino, while the Raetians controlled the Grisons as well as large areas around it.〔 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「Switzerland in the Roman era」の詳細全文を読む スポンサード リンク
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