Fedorwalde-Peterhain was formerly part of the German Empire. In the German Empire, the place was called Fedorwalde-Peterhain.
The place is now called Osiniak-Piotrowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Fedorwalde-Peterhain | German Empire | Sensburg | 1939 |
| Osiniak-Piotrowo | Under Polish administration | Mrągowo | 1945 |
| Osiniak-Piotrowo | Poland | Suwałki | 1992 |