According to a (badly written) sign at the tower:
"It was the north-western tower of the Roman fortifications.
The only tower of the city wall built from 50 A.D. following the elevation of Cologne to a Roman colony, that is almost completely preserved, Elaborate, primarily original preserved decoration of mosaic-style different coloured natural stones (limestone, sandstone, greywacke, trachyte) from the Cologne area as well as other parts of the Roman Empire. Crenellation, around 1900.
Its surprisingly good condition is partly due to the fact that from the early 14th century, the tower was incorporated, as a latrine, into the building complex of the Franciscan convent of St. Clara.
After the convent was closed down (1802) it was rebuilt to a residential tower in 1833.
In 1873 it went into the ownership of the City of Cologne.
1896-97, extension with a neo-Gothic house (Zeughausstr. 13) commissioned by the City of Cologne according to plans by Carl Moritz.
From 1904-1948, home of the Cathedral Construction Offices.
Since 1983 in private ownership."
One of the walking tours I went on seemed to focus quite a deal on the various city gates and walls. This tour can be done quite easily in half a day.
These gates and walls include-: Bayen-tower, Bottmühle, Severins-gate, Ulrepforte / Kartäuserwall, Gereonsmühlentower, and Eigelsteingate.
The Eiegelsteingate is located at the end of the street Eigelstein - funnily enough!!
This old city gate is 12th century and bears the symbol for Cologne's former farmers - the "Kolsche Boor".
To be honest there isnt much of the city walls left, the best place in my opinion to see them is here at the Ulrepforte.
The small amount of wall that is left is very well preserved all the same.
It was well worth our while venturing slightly off the beaten path and visiting the towers of the former city walls. There were no other tourists around and we got to experience a real residential area in the city of Cologne.
The Ulrepforte boasts the largest preserved section of the city walls, it is a huge fairytale like tower located just a short distance from the Severinsgate.
This defence tower also dates back as far as the 12th century.
Severinsgate is easy to find on the walk as its located on a residential street called Severins Wall!! This is an important gate, behind it is Chlodwig Platz and from here was the main road to Rome.
This was the second tower that we visited on our South City Walk...the Bottmuhle was a windmill during the 16th century, before that it was a defence platform.
When the city wall was destroyed in the 19th century this tower was privately rebuilt.
Now it stands proudly in a very residential area, surrounded by apartments and some small shops.
We took a south city walk, which we found the information and route from our hostel...it was well worth it, visiting the towers that many years ago were part of the city walls. The Bayen Tower is the south point for the former city wall and dates back to around the 12th century.
Here is a portion of the original walls of the city. There is a lot of the original wall still remaining all over the city. As you walk from place to place you can see where the original walls existed and the size of the ancient city.
This gate is one of the few remaining examples of the medieval fortifications of Cologne (near Rudolfplatz tram station).
it's pretty cool to think about the history of these Roman structures. What do you imagine about these gates, since their construction in 50 AD?
This arch is in the same square as the cathedral. There is an area behind it where many people sit down to rest.
It doesn't get a lot of hype, but it's not hard to find. I don't have the actual location...but it's there! I promise!