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The Principality of Opole was one of the most important and largest Silesian principalities in the 1470s and 1480s. After the death of Nicholas I (1476), it was ruled jointly by his sons, Nicholas II and John II, who, however, under the pressure of circumstances, departed from their father's policy of supporting Matthias Corvinus. While Nicholas I was among the leading supporters and allies of Matthias Corvinus in Silesia, his sons gradually sided with Matthias' opponents as a result of Matthias' reforms and interventions in the Silesian environment. The culmination of the dispute between the Silesian princes and the King of Bohemia and Hungary can be seen in the events of 1488, when an open conflict broke out between John II. Zaháňský and Jindřich Minsterberský, who represented the princely opposition, and Matthias Korvín. The troops of the Silesian princes were no match for the forces of Matthias Corvinus, who managed to defeat the opposition militarily rather quickly. The defeated princes had to accept harsh punishments - John II. Zaháňský and Henry of Münsterberg were deprived of their principalities, while the remaining princes were mainly punished financially. The Opole brothers Nicholas II and John II supported the princely opposition in this conflict mainly financially, and although their troops did not take part in the fighting, Matthias Corvinus did not forget their support and they too had to accept severe punishments. The present paper will focus, on the basis of new sources, on the question of what the punishment was for the Opole princes, what the monarch demanded of them and how the Opole Piasts themselves reacted.