Piastowo was formerly part of the German Empire. In the German Empire, the place was called Königshagen.
The place is now called Piastowo and belongs to Poland.
| Historical place name | Country | Administration | Time |
|---|---|---|---|
| Königshagen | German Empire | Elbing | before the Versailles Treaty |
| Königshagen | German Empire | Elbing, Land | after the Versailles Treaty |
| Königshagen | German Empire | Elbing | 1939 |
| Königshagen | German Empire | Elbing | 1939 |
| Piastowo | Under Polish administration | Elbląg | 1945 |
| Piastowo | Poland | Elbląg | 1992 |