[2] Albeit, he was considered a prominent lord in the region, his wealth and influence were far behind his uncles, Ivan and Henry II, who had established oligarchic provinces independently of the monarch at the turn of the 13th and 14th centuries, which significantly restricted Nicholas' expansion potential.

[3] Nicholas was first mentioned by contemporary records in March 1314, when he and Ivan's grandson Andrew returned the previously seized Sobor to their familiares, the members of the gens (clan) Osl, including Lawrence.

However John sought assistance from his relatives, Andrew, who administered Western Transdanubia and Nicholas II; they represented the other two branches of the Kőszegi family.

[5] In February 1316, Nicholas issued a letter of donation to his familiaris, Stephen Vönöcki for his loyalty and role in the victorious campaign against the royal troops.

When Stefan Uroš II Milutin invaded the Syrmia, Charles I launched a counter-campaign across the river Száva and seized the fortress of Macsó (present-day Mačva, Serbia) in the winter of 1317.

Taking advantage of the king's absent, Andrew Kőszegi attacked the royalist towns of Sopron and Győr and, simultaneously, he unsuccessfully besieged Léka and Rohonc too, the castles of Nicholas II.

[7] Charles I supported Nicholas, implementing the strategy of "divide and rule" in order to eliminate the Kőszegis' united actions; the king appointed him as ispán of Vas and Zala counties, succeeding Andrew.

He donated the land of Kedhely (present-day Rábakethely, a borough of Szentgotthárd) to the monastery in Borsmonostor (Klostermarienberg, today part of Mannersdorf an der Rabnitz, Austria).