Sadłowo was formerly part of the German Empire. In the German Empire, the place was called Bischofsburg OF..
The place is now called Biskupiec * and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Sadlowo OF. | German Empire | Rößel | 1930 |
| Bischofsburg OF. | German Empire | Rößel | 1939 |
| Sadłowo | Under Polish administration | Reszel | 1945 |
| Biskupiec * | Poland | Olsztyn | 1992 |