Langenau (Kr. Fraustadt) was formerly part of the German Empire. In the German Empire, the place was called Langenau.
The place is now called Łęgoń and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Langenau | German Empire | Fraustadt | before the Versailles Treaty |
| Langenau (Kr. Fraustadt) | German Empire | Fraustadt | after the Versailles Treaty |
| Langenau | German Empire | Fraustadt | 1939 |
| Łęgoń | Under Polish administration | Wschowa | 1945 |
| Łęgoń | Poland | Leszno | 1992 |