He was born into the Nagymartoni (also known as Bajóti, and later Fraknói) family of Aragonese origin, as the younger son of Simon II, who functioned as ispán of Bars County between 1277 and 1278.
[2] For a long time, the brothers did not commit themselves to support Charles I of Hungary in the civil war because of their delicate situation.
When the king launched a campaign against the Kőszegis in Transdanubia and Slavonia in the first half of 1316, the Nagymartonis took an oath of allegiance to Charles.
[2] When Andrew Kőszegi attacked the towns of Sopron and Győr, which refused to acknowledge his supremacy, in the winter of 1317, the burghers successfully repelled the offense with the assistance of the troops of his former familiares, Paul and Lawrence Nagymartoni.
[2] However, around the same time, Peter Csák pillaged and destroyed their castle of Bajót in Esztergom County, which was never rebuilt.
[3] For their loyalty and bravery, Paul and Lawrence regained the castle of Kabold by Charles in 1319, who seized the fort from the Kőszegis in his military campaign.