 The childless Ladislaus V died on 23 November 1457 . A Diet was convened to elect the new monarch . Matthias ' maternal uncle , Michael Szilágyi , arrived with more than 10 @,@ 000 armed noblemen under his command , and the Diet proclaimed Matthias king on 24 January 1458 . Matthias returned from Prague , but was only crowned with the Holy Crown of Hungary on 29 March 1464 , because he had spent the previous years with fighting against his opponents . 
