Krojcburg was formerly part of the German Empire. In the German Empire, the place was called Kreuzburg (Ostpr.).
The place is now called Slavskoe and belongs to Russian Federation.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Kreuzburg (Ostpr.) | German Empire | Preußisch Eylau | 1939 |
| Krojcburg | Under Soviet administration | Kaliningrad | 1945 |
| Slavskoe | Russian Federation | Bagrationovsk | 1992 |