[2] Nicholas and his brother Stephen were first mentioned by a royal charter in 1256, when Béla IV of Hungary obliged their father Paul to return certain acquired lands along the river Sebes-Körös (Crișul Repede): Telegd, Szabolcs, Sonkolyos and Bertény with its royal customs (today Tileagd, Săbolciu, Șuncuiuș and Birtin in Romania, respectively) to the original owners, the members of the Csanád clan.
According to the verdict, Paul and his sons – Nicholas and Stephen – had to swear at the tomb of St. Ladislaus in Várad (present-day Oradea, Romania) to return the occupied lands.
[4] In the previous year (1255), the Geregye troops seized the landholdings of the neighboring Csanád clan; it is plausible that both Nicholas and Stephen had participated in the skirmish.
[10] After the Battle of Kressenbrunn, where Nicholas and Stephen Geregye fought, Béla was forced to renounce Styria in favor of Ottokar II of Bohemia.
Nicholas participated in Stephen's military campaign of 1263 as part of the Hungarian reinforcement in order to provide assistance for Despot Jacob Svetoslav against the Byzantine Empire.
It is possible that they fought in the Battle of Isaszeg in March 1265, as one of Nicholas' castle warriors from Vas County was granted the status of royal servants for his military merits in the battlefield by Stephen.
[11] Historian Attila Zsoldos considers their lands' geographical proximity to the ducal court in Transylvania, and their father' Paul deteriorating relationship with Béla IV both contributed to their involvement in the rebellion against the royal power.
[11] Following the civil war, where Duke Stephen was victorious, Nicholas functioned as Voivode of Transylvania between 1267 and 1268, during the end of the reign of Béla IV (it is presumable, he held the dignity uninterruptedly from 1264 to 1270).