Ludwig of Prussia
1773-1796 Prussia
Friedrich of Prussia (a.k.a. Ludwig)
1794-1863 Prussia
Alexander of Prussia (a.k.a. Ludwig)
1820-1896 Prussia
Ludwig II of Bavaria
1864-1886 Bavaria
Wilhelm I (a.k.a. Ludwig)
1861-1888; 1871-1888 Prussia; German Empire
Waldemar of Prussia (a.k.a. Ludwig)
1889-1945 Prussia
Heinrich of Prussia (a.k.a. Ludwig)
1900-1904 Prussia
Karl Ludwig of Liechtenstein
2016- Liechtenstein