Friedrich Karl of Prussia (middle name Nikolaus)
1828-1885 Prussia
Albrecht of Prussia (middle name Nikolaus)
1837-1906 Prussia
Eugen of Sweden (middle name Nikolaus)
1865-1947 Sweden
Friedrich III (middle name Nikolaus)
1888 German Empire; Prussia
Nikolaus of Liechtenstein
1947- Liechtenstein
Maximilian of Liechtenstein (middle name Nikolaus)
1969- Liechtenstein
Nikolaus of Liechtenstein
2000- Liechtenstein