He was born into the Erdélyi family as one of the five sons of Anthony Erdélyi and his first wife, Margaret Antimus de Tapsony. His father was a prominent familiaris of PalatineNicholas Garai. After Margaret's death sometimes before 1415, Anthony married to a certain noblewoman Clara. One of Nicholas' half-siblings was Stephen I, also a vice-voivode during the reign of King Matthias Corvinus. His sister Catherine was the wife of Nicholas Vízaknai. Nicholas married at first to his distant relative Anne Apafi. After her death, he became the husband of Barbara from an unidentified family, who was mentioned as a widow in 1487. From his two marriages, Nicholas had nine children; his elder son Ladislaus II died without male heirs, while the younger one Stephen II did not survive the childhood.
Career
Nicholas Erdélyi was first mentioned by an estate sales contract on 8 April 1416. Nicholas and Stephen jointly inherited the family landholdings after the death of their father in 1429 or 1430. According to a charter issued on 22 March 1446 at Somkerék, they shared the lands of Somkerék, Sáromberke and Gernyeszeg among themselves, while also owned jointly the villages of Sárpatak, Unoka, Körtekapu, Szekérberete, Rücs, Záh and Lőrinctelke, in addition to parts of Nagydenk, Kisdenk and Mártondenk/Martinesd in Hunyad County. They handed over the latter settlements to King Matthiasin return for Péterlaka and Körtvényfája in 1458, today parts of Gornești commune. In 1448, Erdélyi simultaneously held the office of vice-voivode and ispán of Torda County for a short time, serving alongside other noblemen. Erdélyi possibly represented Regent John Hunyadi in this capacity. In October 1457, he was commissioned by Michael Szilágyi to occupy some lands of his brother-in-law, Nicholas Vízaknai, who became disgraced. It confirmed that the Erdélyi brothers remained loyal to the Hunyadi family during the emerging civil war, thus they received land donations after Matthias ascended the Hungarian throne in 1458. Both of them gained tax exemption of "sheep fiftieth" in 1462, while Nicholas and his adult son Ladislaus also received this privilege in the next year. Matthias transformed the right of customs collection from Sáromberke to Szekérberete in March 1467. Through the 1470s, Nicholas was involved in a lawsuit against his brother Stephen over a mill and its customs in Somkerék, which were unlawfully usurped by Nicholas, in accordance with Stephen's narration. Nicholas argued he built the mill at its own expense in the joint estate. Stephen demanded half of the share and was even willing to pay half the cost of construction, but Nicholas refused it. When Stephen was elected vice-voivode in 1476, using his increased influence, he turned to the Kolozsmonostor Abbey to investigate the case. After their verdict was delivered in favour of Stephen, Voivode John Pongrác called Nicholas to return the Stephen's inherited part of the mill to his brother immediately.
