George of Poděbrady
Pope Paul II excommunicated George of Poděbrady in late 1466 and proclaimed a crusade against him. The Czech Catholic noblemen rose up against the "heretic" George of Poděbrady and sought assistance from Matthias Corvinus. Matthias declared war in March 1468 and invaded Moravia. On 16 May 1468, George of Poděbrady offered Casimir IV to make Vladislaus his heir if Casimir mediated a peace treaty between Bohemia and Hungary. Matthias refused Casimir's offer, but George of Poděbrady forced him to sign a truce in early 1469. Fearing of losing Matthias's support, the Catholic nobles proclaimed him king of Bohemia in Olomouc on 3 May. After George of Poděbrady repeated his offer of bequeathing Bohemia to Vladislaus, Casimir IV entered into negotiations with the Holy Roman Emperor, Frederick III on George of Poděbrady's behalf. George of Poděbrady died on 22 March 1471.