He was born into the Nagymartoni (also known as Bajóti, and later Fraknói) family of Aragonese origin, as the son of Simon II, who functioned as ispán of Bars County between 1277 and 1278.

[6] 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.

[8] After the successful royal campaign against the Kőszegi family in 1317, when, among others, they lost Győr County, Nagymartoni was appointed to its ispán, restoring the position after two decades.

He appeared in that capacity in a document issued on 10 July 1318, when took over the castle of Győr, which was confiscated from the diocese by the monarch due to its strategic importance against Matthew Csák.

[9] 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.

[13] He was styled as simply "magister" in early 1328, when he and his brother Lawrence implemented their brother-in-law Alexander Köcski's last will and testament, and donated certain lands and allowances to their sister, Clara.

[16] As honors to his dignity, Nagymartoni also possessed the castles of Litva, Várna (Óvár) and Sztrecsény (present-day Lietava, Starhrad and Strečno in Slovakia, respectively).

[21] For instance, his court discussed the conflict over the tithe between the Abbey Pannonhalma and the Diocese of Veszprém in 1341, which legitimacy was questioned and contested by the latter's lawyers.

Since 1340, Transylvania returned to the jurisdiction of the Judge royal after sixteen years, excluding some special administrative units in the province (e.g. Szolnok County).

[21] Historian Tibor Almási demonstrated the diverse practice of his judicial activity through the text of a single diploma issued in June 1332, which narrated a lawsuit between John Cselenfi (and his brothers) and the Edelényi family regarding two lands belonged to the largely abandoned Borsod Castle prior to that.

[18] However, there have been countless abuses of power and arbitrariness occurred during Nagymartoni's term, because King Charles had to adopt procedural requirements and restrictive rules in 1341, as a result of complaints following irregularities.

He acted as chief notary (Hungarian: ítélőmester; Latin: protonotarius) and thus he was head of the judicial bureau, effectively the second most prominent member in the staff after Paul Nagymartoni.

[26] One of Nagymartoni's employees was notary James Szepesi, who himself also served as Judge royal in 1370s, as a high impact factor in the history of the dignity.

[19] In the following years, Nagymartoni and his staff were usually fell under the pressure of Queen mother Elizabeth of Poland, who exerted a powerful influence on her son for decades.

[21] When the queen visited the Kingdom of Naples in the summer of 1343 to promote the interests of her second son, claimant Andrew, who was betrothed to Joanna I, Nagymartoni belonged to her escort.

Subsequently, he traveled further to the papal court of Avignon as a member of the Hungarian delegation, led by Vid Vasvári, the Bishop of Nyitra.

Pope Clement VI was the overlord of the Kingdom of Naples; in contrary to their hopes, they were only able to persuade him to promise that Andrew would be crowned as Joanna's husband.

His main residence was the eponymous estate Nagymarton, where – due to his belonging to the elite – national fairs were held and Nagymartoni also erected a parish church dedicated to Saint Martin of Tours there.

Regarding his possessions acquired by himself, Paul excluded the family of his late uncle Michael from the inheritance and made his nephew Nicholas "the German" (son of the deceased Lawrence) his only heir.

Michael's grandson, Nicholas "the Hungarian" was granted half portions of the ancient family estates – e.g. Nagymarton, Fraknó, Bajót and Kabold –, which proved to be a generous deed from Paul, whereas in previous decades their modernization and strengthening was due only to him and Lawrence.