Frojdenberg was formerly part of the German Empire. In the German Empire, the place was called Freudenberg.
The place is now called Ratnoe and belongs to Russian Federation.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Freudenberg | German Empire | Wehlau | 1939 |
| Frojdenberg | Under Soviet administration | Kaliningrad | 1945 |
| Ratnoe | Russian Federation | Gvardejsk | 1992 |