Marienthal was formerly part of the German Empire. In the German Empire, the place was called Marienthal.
The place is now called Kosakowo and belongs to Poland.
Historical place name | Country | Administration | Time |
---|---|---|---|
Marienthal | German Empire | Rastenburg | 1939 |
Kosakowo | Under Polish administration | Kętrzyn | 1945 |
Kosakowo | Poland | Olsztyn | 1992 |