Detailed city map of Kassel with description of all important buildigns and streeets.  Kassel  is a city located on the Fulda River in northern Hesse, Germany. The city's name is derived from the ancient Castellum Cattorum, a castle of the Chatti, a German tribe that had lived in the area since Roman times. In the early 19th century, the Brothers Grimm lived in Kassel. They collected and wrote most of their fairy tales there. Having sided with Austria in the Austro-Prussian War to gain supremacy in Germany, the principality was annexed by Prussia in 1866. The Prussian administration united Nassau, Frankfurt and Hesse-Kassel into the new Prussian province of Hesse-Nassau. Kassel ceased to be a princely residence, but soon developed into a major industrial centre, as well as a major railway junction. Henschel & Son, the largest railway locomotive manufacturer in Germany at the end of the nineteenth century, was based in Kassel.