Stephen I Csák

His nephew and heir was the oligarch Matthew III Csák, who, based on his uncles' acquisitions, became the de facto ruler of his domain independently of the king and usurped royal prerogatives on his territories.

Stephen was born into the gens Csák as one of the four sons of Matthew I, founder and first member of the Trencsén branch, who served as master of the treasury (1242–1245), and Margaret from an unidentified noble family.

[3] Their son, Stephen Sternberg (or "the Bohemian") later inherited the Csák dominion because of the absence of a direct adult male descendant after the death of Matthew III in 1321.

Pope Innocent IV, who died in 1254, instructed Zlaudus Ják, the Bishop of Veszprém to recover the estate for the Roman Catholic Church.

[2] He, along with Matthew II and Peter I, was an influential supporter of duke Stephen, who rebelled against his father, Béla's rule and took over the government of Transylvania in the 1260s.

Ottokar aus der Gaal's Steirische Reimchronik ("Styrian Rhyming Chronicle") refers to him as "Stephan von Schiltberg", i.e. "Stephen from the Vértes Hills".

The Annales Sancti Rudberti Salisburgensis mentions that Ladislaus IV ate together with two barons, including "a brother of" Matthew Csák in 1282.

[11] Stephen had no children, as a result Matthew III inherited his property, who later became the greatest enemy of Charles I during the king's war against the oligarchs and for the unified realm.