Prohn was formerly part of the German Empire. In the German Empire, the place was called Prohn.
The place is now called Braňany and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Prohn | Austro-Hungary | Dux | before the Treaty of Saint-Germain |
| Braňany | Austro-Hungary | Dux | before the Treaty of Saint-Germain |
| Vraňany | Czechoslovakia | Duchcov | after the Treaty of Saint-Germain |
| Prohn | Czechoslovakia | Duchcov | after the Treaty of Saint-Germain |
| Prohn | German Empire | Bilin | 1938 |
| Braňany | Czechoslovakia | Bílina | 1945 |
| Braňany | Czechoslovakia | Most | 1992 |
| Braňany | Czech Republic | Most | 1993 |