Księżydwór was formerly part of the German Empire. In the German Empire, the place was called Niederhof.
The place is now called Księży Dwór and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Niederhof | German Empire | Neidenburg | before the Versailles Treaty |
| Księżydwór | Poland | Działdowo | after the Versailles Treaty |
| Niederhof | German Empire | Neidenburg | 1939 |
| Księży Dwór | Poland | Działdowo | 1945 |
| Księży Dwór | Poland | Ciechanów | 1992 |