In the 15th century, several important meetings and events took place at the Nowy Korczyn castle. In 1461, King Casimir IV Jagiellon hosted here envoys of George of Poděbrady, the Crimean Khanate, and the Margraviate of Brandenburg, and in 1465, szlachta of both Lesser and Greater Poland gathered here to discuss finances needed to end the Thirteen Years' War. In 1470, Casimir IV Jagiellon met at the Nowy Korczyn castle with papal legate and envoy of Emperor Frederick III. On 9 October 1479 Martin Truchseß von Wetzhausen, Grand Master of the Teutonic Knights, paid homage to the Polish king at Nowy Korczyn.