Ivan Kőszegi, Hungarian baron and oligarch

Ivan Kőszegi was an influential lord in the Kingdom of Hungary at the turn of the 13th and 14th centuries. Earlier historiographical works also refer to him Ivan Németújvári. He was Palatine in 1281, between 1287 and 1288, and from 1302 until 1307, Ban of Slavonia in 1275, from 1284 until 1285 and in 1290, and Master of the treasury in 1276 and 1291.

An oligarch or provincial lord was a powerful lord who administered huge contiguous territories through usurping royal prerogatives in the Kingdom of Hungary in the late 13th and the early 14th centuries. The term petty king used to be used as well.