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The Vexin ((:vɛksɛ̃)) is a historical county of northwestern France. It covers a verdant plateau on the right bank (north) of the Seine comprising an area east-to-west between Pontoise and Romilly-sur-Andelle (about 20 km before Rouen), and north-to-south between Auneuil and the Seine near Vernon. The plateau is crossed by the Epte and the Andelle river valleys. ==History== The name of the Vexin is derived from a name for a Gaulish tribe now known as the Veliocasses that inhabited the area and made Rouen their most important city. The Norse nobleman Rollo of Normandy (ca. 846–ca. 931), the first ruler of the Viking principality that became Normandy, made several incursions into the western half of the county. He halted his actions when the Carolingian king Charles the Simple abandoned the part of the territory that Rollo occupied under the Treaty of Saint-Clair-sur-Epte in 911. The terms of the treaty established the Duchy of Normandy and fixed its boundary with the Kingdom of France along the river Epte. This divided the county of Vexin into two parts: *Norman Vexin (''Vexin normand''), which became part of the Duchy of Normandy bounded by the rivers Epte, Andelle and Seine. *French Vexin (''Vexin français''), which remained part of the Île-de-France province bounded by the rivers Epte, Oise and Seine. During the twelfth century, the Vexin was a heavily contested border between the Angevin kings of England and Capetian France. It was of particular importance because of the close proximity to Paris and the location of the route to the coastal cities of Normandy. As a result, the Vexin was the site of defensive castle construction, notably at Château Gaillard. 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「Vexin」の詳細全文を読む スポンサード リンク
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