János; died 1512) was a Hungarian nobleman in the second half of the 15th century, who served as ispán of Bereg County and castellan of Munkács (present-day Palanok, Ukraine) from 1474 to 1482, under his mistress and guardian, Queen Mother Elizabeth Szilágyi.
John (IV) was born into the prestigious Csetneki family, which originated from the ancient Hungarian gens (clan) Ákos and possessed landholdings mainly in Gömör County.
[2] Throughout his younger years, his father stayed away from the family home Csetnek (present-day Štítnik, Slovakia) and actively participated in the wars against the Hussites in Upper Hungary as a familiaris of the Diocese of Eger.
His mother Helena Keresztúri managed the estate affairs, defending the rights of the family against the claims of their neighbors, including the relative Bebeks.
[3] In May 1470, the four surviving sons of the late Andrew – Ladislaus, John, Nicholas and Michael – reconciled with the Bebeks in the castle of Szendrő regarding the unlawful occupation of some lands.
Both Ladislaus and John filed lawsuits against the Bebeks over the possessions rights of the ore mines at Dobsina (present-day Dobšiná, Slobakia).
[7] During his eight years of service as ispán and castellan, John received valuable gifts and treasures from his lady Elizabeth Szilágyi, including a silver-plated sword, a silver bowl, and two pearly and wild leather headgear.
After a peace treaty with his elder brother Vladislaus II, John Albert renounced his claim to Hungary in exchange for the Duchy of Głogów and the suzerainty over half of Silesia on 20 February 1491.
In the next month, Vladislaus granted pardon to the partisans of his brother, including John Csetneki,[11] who was able to attend the Diet of Hungary in Buda as an assessor (a representative of the lower nobility) for Gömör County in the spring of 1492.
[18] Under paterfamilias John, the tower of the local church was renovated and reconstructed sometime between 1501 and 1504; a new organ gallery and a choir bench for city council members were built too.
John also recalled that on several occasions he used his wealth to help his brother, who was involved in various losing lawsuits (including the financial compensation of Tamás Bakócz, Bishop of Eger, who threatened to excommunicate Ladislaus).
[22] John's two daughters, Dorothea and Catherine married brothers Ladislaus and Nicholas Lorántfi de Serke from the prestigious gens (clan) Rátót, respectively.