After Ladislaus' death, Lodomer and his suffragans were dedicated supporters of Andrew III of Hungary, who aimed to restore strong royal power against the rebellious lords and oligarchs.

Based on alleged "old manuscripts", 18th-century historian Miklós Schmitth claimed Lodomer originated from the territory of the Kievan Rus', and was a relative of Rostislav Mikhailovich and the Rurikids.

[5] However genealogist János Karácsonyi refused Knauz's theory, as Gregory Monoszló's father was Thomas, as he already outlined the clan's family tree at the turn of the 19th and 20th centuries.

[1] Beside his duty to proclaim the Scripture readings used in the Liturgy of the Word, Lodomer was responsible for management of the cathedral school of Veszprém and teaching the clerics and the poor scholars, in accordance with the Canon 18 of the Third Council of the Lateran (1179).

[5] Körmendi noted that Lodomer's letters (missilis), which reflect his deepened legal and philological knowledge, prove that he was one of the most educated Hungarian prelates of the 13th century, thus he certainly attended an Italian universitas, but the exact location and date are uncertain.

[12] Based on the researches of literary historian Rabán Gerézdi (1941), Hungarian historiography claimed that a certain Lodomer, son of comes Denis, who was a student of the University of Bologna on 26 October 1268 according to a register, is identical with the namesake prelate.

Lodomer remained loyal to Stephen in the emerging 1260s civil war between the king and the duke, but took on a role of a mediator and conciliator in order to prevent the escalation of their conflict.

[15] In this sense, Lodomer belonged to that youth with illustrious Transdanubian aristocratic origin, who remained without office due to the influence of older generations in the royal court of Béla IV.

When Stephen V ascended the Hungarian throne in May 1270, he granted tax exemption for those serfs and hospes who were subjects of the Diocese of Várad, in addition to free use of mines for the bishopric.

Lodomer founded monasteries, clerical schools and provided priests to numerous villages; these all were part of a restoration attempt in the territory of the diocese, which suffered heavy damages during the Mongol invasion decades earlier.

Nevertheless, Lodomer and his strong ally, Peter Monoszló, who held the dignity of Bishop of Transylvania since 1270, opposed the ambition of the Geregye kindred, which had aspirations to establish dominion independently from the royal power in Bihar County, where the vast majority of the Diocese of Várad located.

In May 1277, Lodomer participated in that general assembly of the prelates, barons, noblemen, and Cumans in Rákos (near Pest),[18] which declared the minor Ladislaus IV to be of age and authorized the 15-year-old monarch to restore internal peace with all possible means.

[24] Following Ladislaus' step, when the Cumans seized and imprisoned Philip of Fermo in early January 1280 on his demand, Lodomer and the bishops, who expressed "the liberty of the Church", turned against the royal power, and became his relentless opponents.

[26] When Bishop Philip of Fermo left Hungary in the autumn of 1281, Lodomer attempted to restore political consolidation, which existed for a short time in 1277–78, before the violent intervention of the Roman Curia.

He offered the support of the Hungarian Church to Ladislaus and interceded to Pope Martin IV in order to invalidate some of the radical measures and decisions of papal legate Philip.

[30] Lodomer persuaded Ladislaus to convene a general assembly in the early summer of 1286 in order to reconciliation between the king and the powerful Kőszegi family, who plundered villages and regions in Transdanubia in recent years.

Lodomer here also entrusted Peter Monoszló to recover the arbitrarily confiscated queenly estates surrounding Beszterce (present-day Bistrița, Romania) from the town's magistrate.

[27] In response, the infuriated king stated that "beginning with the archbishop of Esztergom and his suffragans, I shall exterminate the whole lot right up to Rome with the aid of Tartar swords", according to Lodomer's highly dubious report.

According to Archbishop Lodomer, Ladislaus even stated, "If I had 15 or more sisters in as many cloistered communities as you like, I would snatch them from there to marry them off licitly or illicitly; in order to procure through them a kin-group who will support me by all their power in the fulfillment of my will".

[30] Lodomer cited antique works (the tale of Proteus, poems of Horace, Ovid and Livy's Ab Urbe Condita Libri), in addition to such recent Christian texts, like Bernard of Clairvaux's De consideratione, regarding the theory of "two swords".

[43] On 31 January 1291, Pope Nicholas IV sent a letter to Lodomer, in which he expressed disappointment that the archbishop abandoned his previous "good habit" of continuous correspondence to inform the Holy See about the domestic conditions in Hungary.

[55] The Peace of Hainburg resulted that the Kőszegis rose up in open rebellion against Andrew in spring 1292, acknowledging Charles Martel, as King of Hungary, whose claim was also supported by the Holy See.

The subsequent 1298 laws, which circumscribed the feudal institutions, reflected Lodomer's political will, but the delicate balance was broken between Andrew III and the prelates after his death, despite Archbishop John's efforts.

[48] He permitted the burghers of Szepes Castle (today Spiš in Slovakia) in 1280 to secede from the affiliation of the St. Ladislaus parish and build a church for themselves, maintaining the suzerainty of the Archdiocese of Esztergom.

Alongside Andrew III and other prelates, he was present at the consecration of the Franciscans' Virgin Mary Church in Pressburg (present-day Bratislava, Slovakia) on 26 March 1297, celebrated by vicar James.

[62] During Lodomer's episcopate, Ladislaus IV donated the land of Örmény (a former borough of Esztergom) to the Order of Saint Augustine in 1281, where they established a monastery and conducted theological and artistic studies.

[64] After his coronation, Andrew III donated several landholdings to his ally Lodomer, including the town of Rozsnyóbánya (present-day Rožňava in Slovakia) with its revenues of silver mine (urbura) in 1291, on the grounds that Bernold von Tellesbrunn caused damage of 20,000 marks to the archdiocese during the 1291 Austrian–Hungarian war.

In the 1280s, a neighboring lord, Thomas Hont-Pázmány (son of Abraham, from the clan's Szentgyörgyi branch) constantly plundered the estates of the archbishopric, unlawfully confiscating its revenues and tithes.

Before his death, Matthew II Csák bequeathed the estate Béla in Komárom County to the archbishopric, but John, son of Paul, former ban of Macsó seized the village, causing a damage of 100 marks to Lodomer.

In 1294, Lodomer was granted a portion in the village of Búcs in Esztergom County (today Búč, Slovakia) from the Tengerdi family in exchange for his fortified manor in the northern part of Margaret Island.