In ancient times, Trier was one of the most powerful Roman cities north of the Alps and later even became the imperial residence. Around the year 150, the imposing city wall with four gates was built here. Of these, only the Porta Nigra, Trier’s landmark, remains today. The name means “black gate” and dates back to the Middle Ages, when the once light-coloured sandstone turned black due to dust and weathering. In the 11th century, Trier’s Porta Nigra was then converted into a double church. However, this was reversed by Napoleon, who wanted to see the ancient city gate restored to its original form.
