Ladislaus was reconciled with Ulrich II, Count of Celje, in early 1455. They had been feuding for years, but Ladislaus needed Ulrich's help in his war against the Ottoman Empire. Ladislaus agreed to recognize Ulrich's authority in Carniola, and Ulrich agreed to help Ladislaus in his war.
Unraveling the Legend: The Life and Times of Ladislaus the Posthumous