[1] His father was killed by a lightning strike in 1297, leaving the child Nicholas as the heir of his grandfather Ivan, who had established a province in Western Transdanubia independently of the royal power.
[3] Nicholas first appeared in contemporary records in February 1307, when he was referred to as Master of the treasury in the court of Otto of Bavaria,[4] one of the pretenders to the Hungarian throne, whose aspirations was supported by Ivan Kőszegi.
[7] He owned various castles in the region, for instance Kőszeg, Borostyánkő (today Bernstein, Austria), Sárvár and Bikug (near Deutschkreutz), in addition to the Pannonhalma Archabbey.
[8] Abandoning the political orientation of his grandfather, Nicholas participated in that Diet in Pest on 27 November 1308, where Otto's rival, Charles of Anjou was unanimously proclaimed king.
Accordingly, Maurice, who related to the Kőszegis from his maternal side, wished to recover his previously abandoned goods in order to donate them to the Virgin Mary monastery, located on an island of the Danube, but "king" Nicholas ["son of George"] refused his request after their conversation [in the autumn of 1313].
], Bishop Nicholas of Győr and Andrew, and ordered them to hand over the goods for the monastery, according to Maurice's request, who predicted his death and thus "he has a holy and prophetic soul".