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city, Rhineland-Palatinate Land (state), southwestern Germany. It lies on the right bank of the Moselle (Mosel) River, surrounded by the foothills of the Eifel, Hunsruck, and Mosel mountains, just east of the border with Luxembourg. A shrine of the Treveri, a Germanic tribe, existed at the site (c. 400 BC). The Roman town was founded by the emperor Augustus about 15 BC. The city's strategic position at a crossroads contributed to its rapid rise as a commercial and administrative centre; it was the capital of the Belgic division of Roman Gaul in the 2nd century AD, an imperial seat in the 3rd century, and later, as Treveris, the seat of the emperor responsible for Gaul and Britain. After it became a bishopric in the 4th century, the town was a centre of Christianity north of the Alps, a status it maintained after its capture by the Franks in the 5th century. Trier was designated an archbishopric in 815, its archbishops becoming temporal princes with power over extensive territory; they were made electors of the Holy Roman Empire in the late 12th century.