Ladislaus Hunyadi

Ladislaus accompanied his father in the Battle of Kosovo from October 17-20 1448, despite initial tactical successes, the Hungarians suffered a decisive defeat due to superior Ottoman numbers and archery volleys, forcing a retreat across the Danube, Ladislaus was briefly held hostage by Durad Brankovic, Despot of Serbia.

Disputes over the custody and authority of King Ladislaus V, who had arrived in Hungary in September 1453 after prolonged negotiations to wrest him from Frederick III direct control, yet remained influenced by Habsburg-aligned advisors seeking to diminish Hunyadi power, in 1453 he was appointed Ban of Dalmatia.

In spring 1455 he married Elizabeth of Celje but died in the same year, after the death of his father on August 11 1456 in Zemun from bubonic plague, Ulrich II Count of Celje a prominent Habsburg ally and former father-in-law Ladislaus went to Belgrade with the young King Ladislaus the Posthumous, aiming to assert dominance over the regency and limit Hunyadi influence in Hungarian affairs.

On November 8, 1456, Ulrich and King Ladislaus V arrived at the Belgrade fortress controlled by Hunyadi's forces; Ulrich personal guards were barred from entry, isolating him, the next morning, Hunyadi's men attacked and killed Ulrich, in late 1456, the king demanded the return of royal castles, revenues and garrisons held in Buda and Diósgyőr, Ladislaus refused to return the lands, viewing such concessions as yielding to foreign meddling.

The terrified king, witnessing the violence, pardoned Ladislaus under evident duress, allowing the Hunyadi's to retain control of Belgrade as Ulrich's Cadaver was disposed. In early 1457, following the murder of Ulrich II of Celji, King Ladislaus V summoned Ladislaus Hunyadi to Buda under promise of safe conduct to discuss reconciliation and the kingdom's governance. 

Upon his arrival on March 14, Hunyadi was immediately arrested by royal forces, disregarding the safe conduct pledge and brought before a council comprising baronsagainst the Hunyadi family's growing influence.