Around 1297, he organized his own court, similar to the king's court and he usurped royal prerogatives on his domains, similarly to other oligarchs ("e.g.", Amade Aba, Nicholas Kőszegi) of the beginning of the 14th century. Thus he became the "de facto" ruler of his domain and he made alliances independently of the king. He refused to accept appeals to the king against his decisions and he denied to put claimants in possession of lands the king had granted them on his territories. Although some of the local landowners did not want to accept Matthew's supremacy, but sooner or later, they had to leave their possessions.