Trier (French: Trèves; Luxembourgish: Tréier; Latin: Augusta Treverorum) is a city in Germany on the banks of the Moselle River. It is the oldest city in Germany, founded in or before 16 BC.[1] Trier is not the only city claiming to be Germany's oldest, but it is the only one that bases this assertion on having the longest history as a city, as opposed to a mere settlement or army camp.[citation needed] It is also one of the few cities in Europe that have been capitals of the Roman Empire.

Trier lies in a valley between low vine-covered hills of ruddy sandstone in the west of the state of Rhineland-Palatinate, near the German border with Luxembourg and within the important Mosel wine-growing region.