War of the Hungarian Succession

[5][6] Matthias' illegitime son, John Corvinus was primarily supported by barons and prelates who owned estates along the southern frontier (including Lawrence Újlaki and Peter Váradi, Archbishop of Kalocsa).

[7][9] Vladislaus who had left Prague for Hungary in late June issued a charter promising to refrain from imposing extraordinary taxes or introducing other "harmful novelties" and to closely cooperate with the Royal Council.

[14] Vladislaus married Beatrice of Naples in Esztergom on 4 October, but the marriage was kept secret, although she gave considerable funds to him to finance his campaigns for Hungary.

[14] Vladislaus's supporters relieved Kassa in early December, and Maximilian withdrew from Hungary before the end of the year, because he could not finance his campaign.

[18] In the Peace of Pressburg, signed on 7 November 1491, Vladislaus renounced all territories that Matthias Corvinus had conquered in Austria and also acknowledged the Habsburgs' right to inherit Hungary and Bohemia if he died without a son.

[18][13][19] The Hungarian-Czech Black Army of 18,000 soldiers commanded by Stephen Zápolya routed John Albert at the Battle of Eperjes (Prešov in Slovakia) on 24 December 1491, forcing him to abandon his claim to Hungary.

[18][20] Although the succession dispute itself was practically settled in late 1491, the war was far from over, as the Ottoman Empire sought to exploit Hungary and Croatia's internal instability by invading to make territorial gains, while the Black Army mutinied due to a lack of wages.

[20] The prisoners were escorted to Buda, where the Black Army was officially disbanded and they were allowed to leave abroad under the condition never to come back and claim their payment.

They were so frustrated about their financial status that they allied with Ottoman Mihaloğlu Ali Bey to handle secretly the fort to his Sultan, Bayezid II.