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The North Sea, though often an area of conflict, has an extensive history of maritime commerce and trade routes between its coastal nations whose economies and industries were also able to exploit its resources. The earliest records of Roman explorations of the sea begin in 12 BC. Southern Britain was formally invaded in 43 AD and gradually assimilated into the Roman Empire, beginning sustained trade across the North Sea and the English Channel. The Germanic Angles, Saxons, and Jutes began the next great migration across the North Sea during the Migration Period, conquering, displacing, and mixing with the native Celtic populations. The Viking Age began in 793 and for the next two centuries the Vikings ruled the North Sea. From the Middle Ages until the end of the 15th century, before the development of good roads, maritime trade on the North Sea connected the economies of northern Europe, Britain, and Scandinavia with each other as well as with the Baltic and the Mediterranean. The Netherland low countries and German speaking lands were the central hub for English Channel and North Sea coastal trade and organizations such as the Hanseatic League, aimed at protecting interests of the merchants and trade, also became increasingly prominent.〔Dollinger 1999: 62〕 Important overseas colonies, a vast merchant marine, and a powerful navy made the Dutch the main rivals of growing England, which saw its future in these three spheres. This conflict was at the root of the first three Anglo-Dutch Wars between 1652 and 1673. Scotland emerged as a prominent economic power during the Scottish Enlightenment of the 18th century. Between 1700 and 1815, the North Sea saw only 45 years of peace, and could be regarded as the most dangerous eras to sail the sea. Tensions in the North Sea were again heightened in 1904 by the Dogger Bank incident. However, the British did not face a challenge to their dominance of the North Sea until World War One broke out in 1914. During the First World War the North Sea became the main theatre of the war for surface action. The Second World War also saw action in the North Sea, though it was restricted more to submarines and smaller vessels such as minesweepers, and torpedo boats and similar vessels. After the war, the North Sea lost much of its military significance because it is bordered only by NATO member-states. However, it gained significant economic importance in the 1960s as the states on the North Sea coasts began full-scale exploitation of its oil and gas resources. The North Sea continues to be an active trade route. The countries bordering the North Sea all claim the of territorial waters within which they have exclusive fishing rights. Today, the North Sea is more important as a fishery and source of fossil fuel and renewable energy, since territorial expansion of the adjoining countries has ceased. ==Naming== One of the earliest recorded names was ''Septentrionalis Oceanus'', or "Northern Ocean" which was cited by Pliny.〔 〕 However, the Celts who lived along its coast referred to it as the ''Morimaru'', the "dead sea", which was also taken up by the Germanic peoples, giving ''Morimarusa''.〔Akin to Welsh ''môr'' "sea" and ''marw'' "dead"; the -''sa'' suffix is a Proto-Germanic form akin to English ''sea''.〕 This name may refer to the dead water patches resulting from a layer of fresh water sitting on top of a layer of salt water making it quite still.〔Oskar Bandle, Kurt Braunmuller, Lennart Elmevik, and Gun Widmark, ''The Nordic Languages: An International Handbook of the History of the Northern Germanic Languages'' (Leiden, Netherlands: Walter de Gruyter, 2002), 596.〕 Names referring to the same phenomenon lasted into the Middle Ages, e.g., Old High German ''mere giliberōt'' and Middle Dutch ''lebermer'' or ''libersee''. Other common names in use for long periods were the Latin terms ''Mare Frisicum'',〔 〕 ''Oceanum-'' or ''Mare Germanicum''〔 〕 as well as their English equivalents, "Frisian Sea",〔 〕 "German Ocean",〔 〕 "German Sea"〔 〕 and "Germanic Sea" (from the Latin ''Mare Germanicum'').〔 〕〔Other names were Amalchium Mare, Britannie ef Frisie mare, Fresonicus Ocecnus, Magnum Mare, Occidentale Mare, Occidentalis Oceanus 〕 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「History of the North Sea」の詳細全文を読む スポンサード リンク
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