NN was formerly part of the German Empire. In the German Empire, the place was called NN.
The place is now called Książęcy Las and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Fürstenwalde | German Empire | Lissa | before the Versailles Treaty |
| Książęcy Las, Leśnictwo | Poland | Leszno | after the Versailles Treaty |
| NN | German Empire | Lissa (Wartheland) | 1939 |
| Książęcy Las | Poland | Leszno | 1945 |
| Książęcy Las | Poland | Leszno | 1992 |