Hungarian nobles and the Ottoman crisis

Timeline

1. 1451–1453Buda · HungaryThe fall of Constantinople in 1453 exposed Hungary's southern frontier directly to Ottoman arms. At the Buda court, the court faction represented by Count Ulrich II of Celje, guardian of the young king Ladislaus V, clashed fiercely with John Hunyadi's military noble group over defense policy and regency power, severely constraining the state's capacity for mobilization.
2. 1455–1456Belgrade · SerbiaThe Ottoman army besieged Belgrade, forcing Hungarian nobles to temporarily set aside their internal strife to face the common enemy. Pope Callixtus III called for crusader reinforcements, and John Hunyadi won a great victory. However, plague spread after the battle and Hunyadi died of illness, quickly reigniting factional conflicts and plunging the defense system back into chaos.
3. 1457–1460Prague · BohemiaIn November 1457 the young king Ladislaus V died suddenly in Prague. Previously the young king had executed Ladislaus Hunyadi (March 1457) and imprisoned his brother Matthias Hunyadi. After the young king's death, in January 1458 the Hungarian Diet elected Matthias as king; he subsequently suppressed noble opposition, and by 1460 Hungary had recovered a measure of stability from its internal and external crises, though Ottoman frontier pressure persisted.