Page "Dortmund" Paragraph 4

A small village at the location of Dortmund was mentioned in official documents from 880 to 885 as Throtmanni.

After it was destroyed by a fire, the Holy Roman Emperor Frederick I ( Barbarossa ) had the town rebuilt in 1152 and resided there for two years.

It became an Imperial Free City in 1220.

During that century, it was the " chief city " of the Rhine, Westphalia, the Netherlands Circle of the Hanseatic League.