Under Elector Friedrich von Saarwerden the city wall was built in 28 years of construction (1396-1424). Around the same time, around 1419, the elevation of the town to the city took place. The city wall was about ten meters high and walkable, as some staircases still show today. The Koblenzer Tor, or rear gate, as it was called in older sources, was probably destroyed in the 17th century.

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