Trèves

"Trier, a German city with Roman roots Founded in 16 BC on a site belonging to the Celtic Trevires people, the city of Trier was initially named Augusta Treverorum in honour of emperor Augustus. It soon became an important city, an administrative and economic centre, and eventually the capital of the Roman province of Belgian Gaul (Gallia Belgica). Thanks to the many historical vestiges still visible from this prosperous period and its clearly established roots in Roman times, Trier is widely recognised as the oldest city in Germany, although other cities dating back to antiquity, such as Worms and Cologne, are also strong contenders for this title."