Bretnov was formerly part of the German Empire. In the German Empire, the place was called Breitenau.
The place is now called Široká Niva and belongs to Czech Republic.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Breitenau | Austro-Hungary | Freudenthal | before the Treaty of Saint-Germain |
| Bretnov | Austro-Hungary | Freudenthal | before the Treaty of Saint-Germain |
| Bretnowa | Austro-Hungary | Freudenthal | before the Treaty of Saint-Germain |
| Bretnov | Czechoslovakia | Bruntál | after the Treaty of Saint-Germain |
| Breitenau | Czechoslovakia | Bruntál | after the Treaty of Saint-Germain |
| Breitenau | German Empire | Freudenthal | 1938 |
| Bretnov | Czechoslovakia | Bruntál | 1945 |
| Široká Niva | Czechoslovakia | Bruntál | 1945 |
| Široká Niva | Czechoslovakia | Bruntál | 1992 |
| Široká Niva | Czech Republic | Bruntál | 1993 |