However, since 1462, Casimir IV had had an alliance with George of Poděbrady, which caused Pope Pius II suspicion after the Thirteen Years' War, during which Poland fought against the Teutonic Order.
Namun, sejak tahun 1462 Kazimierz IV beraliansi dengan Jiří dari Poděbrady, dan Paus Pius II curiga mengenai hal ini setelah Perang Tiga Belas Tahun, di mana Polandia melawan Ordo Teutonik.