Prussia

noun2

1. •
   (historical) A geographical area on the Baltic coast of Northeast Europe.
2. •
   (historical) A former duchy, kingdom and (after German unification in 1871) a federal state of Germany, existing in various forms from 1525 to 1947, when it was disbanded by the Allies; it expanded from the above region and included parts of what is now Germany, Poland, Russia, Lithuania, Denmark, Belgium and Czechia.