Ciazen was formerly part of the German Empire. In the German Empire, the place was called Streben.
The place is now called Ciążeń and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Ciazen | Russian Empire | Slupcy | 1914 |
| Ciążeń | Poland | Konin | 1921 |
| Ciążeń | German Empire | Konin | 1939 |
| Streben | German Empire | Konin | 1939 |
| Ciążeń | Poland | Słupca | 1945 |
| Ciążeń | Poland | Konin | 1992 |