Why is the house Bonngasse 18 called "Im Mohren"?

The house is like Beethoven's birthplace one of the oldest, still present 18th-century buildings in Bonn. In the middle of the 19th century the house accommodated a store for colonial goods. Around that time, the figure on the front and the byname "Im Mohren" (to the blackamoor) appeared for the first time. The building including its front was declared a historic monument. A plaque explains the history of the house and façade design from today's perspective.