https://en.wikipedia.org/wiki/Prussian_Confederation

The Prussian Confederation (German: Preußischer Bund, Polish: Związek Pruski) was an organization formed on 21 February 1440 at Marienwerder by a group of 53 nobles and clergy and 19 cities in Prussia, to oppose the arbitrariness of the Teutonic Knights. It was based on the basis of an earlier similar organization, the Lizard Union established in 1397 by Chełmno Land nobles. In 1454, the leader of the Confederation, Johannes von Baysen (Jan Bażyński), formally asked King Casimir IV Jagiellon, to incorporate Prussia into the Kingdom of Poland
https://en.wikipedia.org/wiki/Lizard_Union_(medieval)

The Lizard Union or Lizard League (German: Eidechsenbund; Polish: Związek Jaszczurczy) was an organization of Prussian nobles and knights established in Culmerland (Chełmno Land) in 1397. Its declared goal was to combat lawlessness, although it discreetly sought the transfer of Culmerland from the Teutonic Knights to Poland.[1] The union was founded by Nicholas von Renys, John of Pulkow, Frederick of Kitnow, and Nicholas of Kitnow. It was named after its emblem, a lizard (eyne eydechse), and expanded its influence to other provinces. (...) it laid the foundation of the later Prussian Confederation, which requested the annexation of the Monastic State of the Teutonic Knights into Poland in 1454.