Erlenthal was formerly part of the German Empire. In the German Empire, the place was called Erlental.
The place is now called Olszyna * and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Erlenthal | German Empire | Kempen i. Posen | before the Versailles Treaty |
| Olszyna, Dwór | Poland | Kępno | after the Versailles Treaty |
| Erlental | German Empire | Kempen (Wartheland) | 1939 |
| Olszyna, Osada | Poland | Ostrzeszów | 1945 |
| Olszyna * | Poland | Kalisz | 1992 |