Michael Lutz submitted this route which is in Bavaria, in the foothills of the Alps:
The Koenig-Ludwig-Weg was opened in 1977. With it's length of 120km it crosses all regions and villages that represented an important part in Ludwig's (who became king in 1864) life. The path starts at Starnberger See (where the king died in 1886) and ends in Fuessen near the famous Neuschwanstein Castle.
More info in English & nice photos on this site: http://king-ludwig-way.com/