Following the death of King Andrew III, he became the Neapolitan prince's follower, but shortly afterwards, he joined the party that offered the crown to Wenceslaus, the son of King Wenceslaus II of Bohemia. He was present at the coronation of the young Bohemian prince (27 August 1301) who granted him Trencsén and Nyitra counties; therefore he became the lawful holder of all the royal castles and possessions in the two counties. In the following years, Matthew Csák occupied the possessions of the Balassa family in the two counties and he also took several castles in Nógrád and Hont counties.