Masern was formerly part of the German Empire. In the German Empire, the place was called Masern.
The place is now called Veliko Mraševo and belongs to Slovenia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Gross-Mraschewo | Austro-Hungary | Gurkfeld/Krško | before the Treaty of Saint-Germain |
| Veliko Mraševo | Austro-Hungary | Gurkfeld/Krško | before the Treaty of Saint-Germain |
| Veliko Mraševo I | Yugoslavia | Krško | after the Treaty of Saint-Germain |
| Masern | German Empire | Rann | 1941 |
| Veliko Mraševo | Yugoslavia | Novo mesto | 1945 |
| Veliko Mraševo | Yugoslavia | Socialistična rep. Slovenija | 1992 |
| Veliko Mraševo | Slovenia | Slowenien | 1991 |