The Porta Nigra (Black Gate) is Trier’s landmark. The Romans built it in the 2nd century AD out of huge sandstone blocks that weighed up to 6 tons and were held together by iron clamps.
With the ending of the Roman Empire and changing times, the city gate was used for a variety of purposes. In the 11th century it served as an abode for the monk Simeon, who lived as a hermit. On his death the city gate was converted into a church, which was another reason for its survival. The subsequent centuries were marked by renovation and maintenance measures. In 1803 under Napoleon’s rule the church was dissolved, and orders were given to restore its ancient design.