Zosin, Folwark was formerly part of the German Empire. In the German Empire, the place was called Joachimstal.
The place is now called Zosin and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Joachimsthal | German Empire | Kempen i. Posen | before the Versailles Treaty |
| Zosin, Folwark | Poland | Kępno | after the Versailles Treaty |
| Joachimstal | German Empire | Kempen (Wartheland) | 1939 |
| Zosin | Poland | Kępno | 1945 |
| Zosin | Poland | Kalisz | 1992 |