Pietno was formerly part of the German Empire. In the German Empire, the place was called Wallgen.
The place is now called Piętno and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Pietno | Russian Empire | Turek | 1914 |
| Piętno | Poland | Turek | 1921 |
| Piętno | German Empire | Turek | 1939 |
| Wallgen | German Empire | Turek | 1939 |
| Piętno | Poland | Turek | 1945 |
| Piętno | Poland | Konin | 1992 |