The study is concerned with the conspiracy against King Matthias Corvinus of Hungary in 1471, probably the most serious expression of opposition from the Hungarian nobility against his rule. It is directed towards the course of the rebellion, which was closely connected with a Polish invasion of the Kingdom of Hungary. The core of the paper comprises a description and analysis of the rebellion of part of the Hungarian clergy and nobility led by John Vitéz Archbishop of Esztergom. The paper deals with the causes of the opposition and the motivation of the leading actors, which led to their open rebellion against their monarch, and participation in the subsequent Jagiellonian intervention. It is also concerned with the question of support for the conspiracy in the framework of the nobility and clergy of Hungary, as well as the fate of the representatives of the Hungarian opposition.