Instead, he suggested the "Keszei" surname because Judge royal Thomas Szécsényi donated the land of Kesző or Keszi (Garamkeszi; present-day Hronské Kosihy, Slovakia) to him in August 1351, which act was confirmed by Louis I of Hungary in February 1365.

Mór Wertner objected to Pór's arbitrary name selection and, also revising his earlier position, suggested the "Lévai" family name because the prelate's two nephews appeared with the "de Lewa" suffix.

Modern historians – including Kornél Szovák, Pál Engel and Enikő Csukovits – began to use the "Apáti" family name.

It is plausible that he did not attend a foreign universitas because Pope Clement VI did not mention his academic skills during his appointment as Bishop of Zagreb.

[2] Apáti actively participated in the last phase of the conversion of the pagan Cumans, who had settled in Hungary a century before, which was completed during the reign of Louis.

As vice-chancellor, Apáti was a draftsman of that law (later called ius viaticum), which confirmed all provisions of the Golden Bull of 1222, save the one that authorized childless noblemen to freely will their estates.

The law introduced an entail system, which existed until the Hungarian Revolution of 1848, prescribing that childless noblemen's landed property "should descend to their brothers, cousins and kinsmen".

The Hungarian monarch interceded at the Roman Curia in the bishop's interest on 1 July 1352, when he requested Pope Clement to authorize confessional grace and absolution in certain cases to the Diocese of Zagreb.

Apáti also received permission from the papal court to freely donate two benefices within the chapters of Zagreb and Čazma (Csázma).

[11] According to historian Imre Szentpétery, Apáti adopted the title, which indicated a more influential and worthy dignity, but in fact, continued the same work as his years as vice-chancellor of the royal court.

Since the late 13th century, the vice-chancellors were considered de facto managers of the chancellery, while the chancellor's office depreciated into an honorary title.

When Apáti was elevated to the archbishopric, the office of vice-chancellor became a degrading title, which would have suggested a setback among the office-holders in the royal court.

He had no auxiliary bishops who could substitute for him in Kalocsa, so he requested that the pope authorize him to consecrate priests and celebrate mass in the whole territory of the kingdom.

In the same document, the pope also granted four or five years of indulgence for those penitents who went on a pilgrimage to the Assumption Cathedral of Kalocsa, which building, a "poor and formless church" has been neglected in recent decades.

[12] Due to the contribution of the pope, Apáti successfully recovered the archbishopric's lands in Hont and Gömör counties in August 1357, which were exchanged by one of his predecessors, Ladislaus Jánki in the occasion of a disadvantageous contract with Thomas Szécsényi in 1334.

[13] A supplication also contains information on Apáti's health condition: because of his physical weakness and the poor digestive system of his stomach, he requested the pope to receive an exemption from that Hungarian tradition during fasting, when practices the faithful abstain from eating eggs, milk and any dairy or animal products.

[9] On 21 September 1358, Apáti, as postulated Archbishop of Esztergom, presided over the investigating court over the charges of disloyalty and betrayal against John, the lector of the Roman Catholic Diocese of Bosnia.

Apáti summoned a trial to Bács (present-day Bač, Serbia), also attended by some Hungarian prelates and other secular lords.

[18] Apáti took the royal seal to his military camp, which was stolen during the siege by his servants and sold it to a goldsmith, who resided in Beszterce (present-day Bistrița, Romania).

He levied a three-year tithe on the church revenues in Hungary and asked Louis to support the papal officials to collect the tax.

However, Louis I and Palatine Kont made every effort to hinder the activities of the papal tax collectors, stating that he needed resources to cover the costs of his future wars against the infidels and the pope's enemies in Italy.