autonomous dependency/protectorate of the Kingdom of Poland (1466–1569)
via Wikipedia infobox
Today part ofPoland Russia¹ ¹ Small portion of the Vistula Spit around Narmeln (Polski)
Royal Prussia (Polish: Prusy Królewskie; German: Königlich-Preußen or Preußen Königlichen Anteils, Kashubian: Królewsczé Prësë) or Polish Prussia (Polish: Prusy Polskie; German: Polnisch-Preußen) was a province of the Crown of the Kingdom of Poland, which was established following the Second Peace of Thorn (1466) from territory in Pomerelia and western Prussia which had been part of the State of the Teutonic Order. Royal Prussia retained its autonomy, governing itself and maintaining its own laws, customs, and rights.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).