A locator (text-free) map showing the Archbishopric of Cologne as of 1645.  This is based on Willem and Joan(nes) Blaeu's 1645 map File:Blaeu 1645 - Coloniensis Archiepiscopatus.jpg.  
The gray lines show modern day national borders.  Except for the Emscher river, the rivers are shown in their modern routes/channels/paths.  Major cities are shown with circles, and Bonn is shown as the capital of the Archbishopric.  

Mercator projection.   A scale is at the bottom layer of the SVG (you will need an SVG editor to see it).
Own work
MapMaster