His birth name was Nicholas, but contemporaries exclusively called him "Kónya" after his drooping ears. He was born into the powerful Szécsényi family as the eldest son of Thomas Szécsényi, Voivode of Transylvania and his first wife, an unidentified daughter of nobleman Paul Visontai from the gens Aba. His brothers were prelate Michael, Bishop of Vác then Eger, and Stephen, who was mentioned only once in 1331. After their mother's death, Thomas Szécsényi married to Anne, Duchess of Auschwitz. The marriage produced further three children, but all of them died in their childhood. Kónya first appeared in contemporary documents as a young courtier in 1327, when he already served as Master of the stewards for Queen Elizabeth, spouse of Charles I of Hungary. Despite his court function, he was not present on 17 April 1330, when Felician Záh, stormed into the dining room of the royal palace at Visegrád with a sword in his hand and attacked the royal family. However Kónya Szécsényi's familiar, deputy master John Cselenfi stabbed the assassin and the arriving royal guards killed Felician. Szécsényi functioned as Master of the stewards in the Queen's Court until 1340. He became a staunch supporter of Louis I, who ascended the throne in 1342 after his father's death. The king's mother Elizabeth "acted as a sort of co-regent" for decades, because she exerted a powerful influence on him, which also resulted her courtier Szécsényi's growing influence. He actively participated in the Neapolitan campaigns of Louis the Great, residing in Italy for years. He was involved in the siege of Corato, leading a garrison composed of Hungarian and "Lombard" soldiers. He served as ispán of Sáros and Szepes Counties from 1346 to 1349, and of Nógrád County from 1346 to 1350. He was mentioned as castellan of Csejte Castle in 1354. Between 1354 and 1360, he served as ispán of Gömör County and castellan of Fülek Castle. He was made ispán of Pozsony County, holding the dignity from 1360 to 1362. He finished his career as Ban of Croatia and Dalmatia, serving in this capacity from 1366 until his death in the next year. Kónya Szécsényi married Elizabeth Haschendorfer, a daughter of Austrian noble Wulfing I Haschendorfer from Haschendorf/Hasfalva. After her brother Wulfing II was killed in the Siege of Zadar and left no male heirs, King Louisgranted the status of a son to Elizabeth in 1347, authorizing her to inherit her father's landed property. As a result of this, Szécsényi acquired the castle of Ecseg and other estates through his wife, which after then belonged to the Hollókő lordship. The couple had three sons: Frank, Nicholas I and Simon. Frank and Simon became notable barons during the reign of Sigismund of Luxembourg, who continued to expand family wealth and held important dignities, while Nicholas, who owned the village of Cered, was last mentioned in 1383, possibly died around that year.
