Gossau was formerly part of the German Empire. In the German Empire, the place was called Gossau.
The place is now called Kosov and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Gossau | Austro-Hungary | Tachau | before the Treaty of Saint-Germain |
| Kosov | Austro-Hungary | Tachau | before the Treaty of Saint-Germain |
| Kosov | Czechoslovakia | Tachov | after the Treaty of Saint-Germain |
| Gossau | Czechoslovakia | Tachov | after the Treaty of Saint-Germain |
| Gossau | German Empire | Tachau | 1938 |
| Kosov | Czechoslovakia | Tachov | 1945 |
| Kosov | Czechoslovakia | Tachov | 1992 |
| Kosov | Czech Republic | Tachov | 1993 |