John I Ernuszt

His career in the administration of royal revenues began in 1461, with responsibility for the collection of the thirtieth (a custom duty) in Pozsony County.

Ernuszt inspired Matthias's reform of the royal revenues (especially the centralization of their administration and the abolishment of tax exemptions) in 1467.

[1] Since he regularly delivered goods to the royal court, he was introduced to Matthias Corvinus, King of Hungary.

[3] Emeric Zápolya, who was royal treasurer between 1459 and 1464,[4] tasked John with the administration of the thirtieth (a custom duty) in Pozsony County in 1461.

[2] John, and two burghers of Buda, Lawrence Bajoni and Stephen Kovács, concluded an agreement and took charge of the administration of the same tax in the whole kingdom in 1464.

[3][5] Ernuszt inspired Matthias Corvinus's reform of the royal revenues, especially the centralization of their administration and the abolishment of previous tax exemptions.

[3] He was initially responsible only for the management of the ordinary royal revenues, because Janus Pannonius, Bishop of Pécs, administered all extraordinary income as chief treasurer.

[2][8] John persuaded the king to put a new official, the Prefect of the Jews, at the head of the Jewish community in Hungary.

[1] The perfects were chosen from among the members of the Mendel family[9] who were allegedly Ernuszt's kinsmen, according to historian Tamás Fedeles.

[2] John Ernuszt was one of the few commoners making a career during Matthias Corvinus's reign to be able to secure the aristocratic status of his family.