King of Prussia
King of Prussia was the title Frederick the Great started using in 1772 after he took over a lot of the Kingdom of Poland.
Before this he had called himself King in Prussia.[1]
The rulers of Berlin kept using the title after they also became German Emperors, up until Kaiser Wilhelm II abdicated (resigned) in 1918.
References[change | change source]
- ↑ Hall (trans), Colin (2005). The Electors of Brandeburg, Kings of Prussia, German Kaisers.. Karwe : Edition Rieger. ISBN 3935231644.
