 In 1450, Długosz was sent by Queen Sophia of Halshany and King Casimir to conduct peace negotiations between John Hunyadi and the Bohemian noble Jan Jiskra of Brandýs, and after six days' of talks convinced them to sign a truce.In 1455 in Kraków, a fire spread which destroyed much of the city and the castle, but which spared Długosz's house.In 1461 a Polish delegation which included Długosz met with emissaries of George of Podebrady in Bytom, Silesia.