Gruta was formerly part of the German Empire. In the German Empire, the place was called Frankenhain.
The place is now called Gruta * and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Frankenhayn | German Empire | Graudenz | before the Versailles Treaty |
| Gruta | Poland | Grudziądz | after the Versailles Treaty |
| Frankenhain | German Empire | Graudenz | 1939 |
| Gruta * | Poland | Grudziądz | 1945 |
| Gruta * | Poland | Toruń | 1992 |