A while back I read a book about Corland, a very strange nowhere sort of region that was administered by the Teutonic Order. I'm not even sure exactly where it was situated, somewhere within present-day Latvia, with access to the Baltic near Riga so presumably of strategic/commercial value. Trade rather than religious doctrine seems to have been their main concern.
The areas controlled by the Teutonic Order amount to a buffer zone between Russia and Europe, an east-west no man's-land or perhaps free trade zone. As founders of the Hanseatic League this would be mostly in their own interests but everyone else's too as indicated by their longevity. The Order may be officially defunct but not where the House of Hohenzollern is in the frame. The Hohenzollern dynasty ended in 1918 but still has a living representative in Michael, the deposed king of Romania.
[Romania's 'neutrality' notwithstanding, at the end of WWII Michael managed to get himself awarded "the highest degree (Chief Commander) of the Legion of Merit by U.S. President Harry S. Truman... and was also decorated with the Soviet Order of Victory by Joseph Stalin"]