Sachen was formerly part of the German Empire. In the German Empire, the place was called Sachen.
The place is now called Zachy and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sachen | German Empire | Neidenburg | 1939 |
| Zachy | Under Polish administration | Nidzica | 1945 |
| Zachy | Poland | Olsztyn | 1992 |