Časlawsko was formerly part of the German Empire. In the German Empire, the place was called Čáslavsko.
The place is now called Čáslavsko and belongs to Czechoslovakia.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Časlawsko | Austro-Hungary | Ledeč | before the Treaty of Saint-Germain |
| Čáslavsko | Austro-Hungary | Ledeč | before the Treaty of Saint-Germain |
| Čáslavsko | Czechoslovakia | Ledeč nad Sázavou | after the Treaty of Saint-Germain |
| Tschaslawsko | German Empire | Ledetsch an der Sasau | 1939 |
| Čáslavsko | German Empire | Ledetsch an der Sasau | 1939 |
| Čáslavsko | Czechoslovakia | Ledeč nad Sázavou | 1945 |
| Čáslavsko | Czechoslovakia | Jižní Čechy | 1992 |