"Luke guided the boyhood of the young king [Stephen III] to a most peaceful conclusion, but he was less successful during his youth.
For when the king became a young man, he entertained loftier projects than he could possibly sustain, and, after the failure of his own means, he refrained not from consuming so the possessions of the Church.
When Luke, after many tearful warnings, still found him willful and headstrong, he, weeping all the while, subjected the youth to anathema.
Finally, by many prayers raised to Heaven, Luke gained for the king God's grace, so that he was turned to true repentance and hastened to the church of Gran [Esztergom] to give Luke the satisfaction for which he yearned.
Luke, attended by all the clergy and a festive throng of people, came to meet him with open joy and welcomed him with full absolution.
While others were merrily singing, Luke wept in secret.
Then the king asked: »What is it, dearest father, that maketh thee weep amid such general rejoicing?«
 And Luke replied, »How can I rejoice, forsooth, when on this very day next year, amid our passionate distress, thou wilt be borne into this very place a dead man?«
 And so it came to pass."

— Walter Map: De nugis curialium
The dethroned Stephen IV first fled to the Holy Roman Empire, but left shortly afterwards for the Byzantine Empire, where Emperor Manuel promised him support.
The Byzantine Emperor sent an army to Hungary to help Stephen IV regain the throne from his nephew.
Large-scale military campaigns characterized the following years; Lucas, along with the Dowager Queen Euphrosyne, advised Stephen III throughout his reign.
After a peace treaty with Emperor Manuel, Stephen III agreed to send his younger brother, Béla, to Constantinople and to allow the Byzantines to seize Béla's duchy, which included Croatia, Dalmatia and Sirmium.
In an attempt to recapture these territories, Stephen III waged wars against the Byzantine Empire between 1164 and 1167, but could not defeat the Byzantines.

During the war with the Byzantine Empire, Stephen III sought assistance from Emperor Frederick, Pope Alexander's enemy.
The alliance, despite its reasonable military considerations, was strongly opposed by Lucas and the pope, who requested Lucas via Archbishop Eberhard of Salzburg to prevent Stephen III from seeking military help from the Holy Roman Empire.
Pope Alexander, additionally, complained that celibacy was not universal among the prelates in Hungary.
There is also evidence that suggests that Stephen III seized Church revenues to finance his war with the Byzantine Empire.
As a result, Lucas' relationship worsened with his monarch sometime after 1165 or 1166, and resulted in leaving the royal court for years.
The royal chapel, which was responsible for drafting and issuing royal diplomas under the guidance of the Archbishop of Esztergom, ceased its operations during Lucas' voluntary withdrawal.
His notary Becen remained loyal to him, and only three royal charters were preserved between 1166 and 1169; as only church employees were the only ones able to read and write, the lower number of charters drafted represented the temporary decline of literacy.

Pope Alexander sent his legate Cardinal Manfred to Hungary in 1169, who discussed the debated issues with the king, the queen mother, and the prelates.
Manfred and Lucas convened a synod to Esztergom (called Third Council of Esztergom).
The negotiations ended in an agreement that prohibited the monarch from arbitrarily deposing or relocating the prelates or confiscating their property.
Stephen III also acknowledged Alexander as the legitimate pope.
Makk wrote Archbishop Lucas was one of the key drafters of the concordat.

However the pope supported Stephen III against Lucas when the archbishop attempted to hinder the consecration of the king's protégé, Andrew, Bishop-elect of Győr, because of his allegedly non-canonical election.
Although Manfred admonished Lucas to celebrate Andrew's consecration, he refused to do so, demonstrating that his relationship with the Holy See was no longer harmonious by the end
"Luke guided the boyhood of the young king [Stephen III] to a most peaceful conclusion, but he was less successful during his youth. For when the king became a young man, he entertained loftier projects than he could possibly sustain, and, after the failure of his own means, he refrained not from consuming so the possessions of the Church. When Luke, after many tearful warnings, still found him willful and headstrong, he, weeping all the while, subjected the youth to anathema. Finally, by many prayers raised to Heaven, Luke gained for the king God's grace, so that he was turned to true repentance and hastened to the church of Gran [Esztergom] to give Luke the satisfaction for which he yearned. Luke, attended by all the clergy and a festive throng of people, came to meet him with open joy and welcomed him with full absolution. While others were merrily singing, Luke wept in secret. Then the king asked: »What is it, dearest father, that maketh thee weep amid such general rejoicing?« And Luke replied, »How can I rejoice, forsooth, when on this very day next year, amid our passionate distress, thou wilt be borne into this very place a dead man?« And so it came to pass."
— Walter Map: De nugis curialium
The dethroned Stephen IV first fled to the Holy Roman Empire, but left shortly afterwards for the Byzantine Empire, where Emperor Manuel promised him support. The Byzantine Emperor sent an army to Hungary to help Stephen IV regain the throne from his nephew. Large-scale military campaigns characterized the following years; Lucas, along with the Dowager Queen Euphrosyne, advised Stephen III throughout his reign. After a peace treaty with Emperor Manuel, Stephen III agreed to send his younger brother, Béla, to Constantinople and to allow the Byzantines to seize Béla's duchy, which included Croatia, Dalmatia and Sirmium. In an attempt to recapture these territories, Stephen III waged wars against the Byzantine Empire between 1164 and 1167, but could not defeat the Byzantines.
During the war with the Byzantine Empire, Stephen III sought assistance from Emperor Frederick, Pope Alexander's enemy. The alliance, despite its reasonable military considerations, was strongly opposed by Lucas and the pope, who requested Lucas via Archbishop Eberhard of Salzburg to prevent Stephen III from seeking military help from the Holy Roman Empire. Pope Alexander, additionally, complained that celibacy was not universal among the prelates in Hungary. There is also evidence that suggests that Stephen III seized Church revenues to finance his war with the Byzantine Empire. As a result, Lucas' relationship worsened with his monarch sometime after 1165 or 1166, and resulted in leaving the royal court for years. The royal chapel, which was responsible for drafting and issuing royal diplomas under the guidance of the Archbishop of Esztergom, ceased its operations during Lucas' voluntary withdrawal. His notary Becen remained loyal to him, and only three royal charters were preserved between 1166 and 1169; as only church employees were the only ones able to read and write, the lower number of charters drafted represented the temporary decline of literacy.
Pope Alexander sent his legate Cardinal Manfred to Hungary in 1169, who discussed the debated issues with the king, the queen mother, and the prelates. Manfred and Lucas convened a synod to Esztergom (called Third Council of Esztergom). The negotiations ended in an agreement that prohibited the monarch from arbitrarily deposing or relocating the prelates or confiscating their property. Stephen III also acknowledged Alexander as the legitimate pope. Makk wrote Archbishop Lucas was one of the key drafters of the concordat.
However the pope supported Stephen III against Lucas when the archbishop attempted to hinder the consecration of the king's protégé, Andrew, Bishop-elect of Győr, because of his allegedly non-canonical election. Although Manfred admonished Lucas to celebrate Andrew's consecration, he refused to do so, demonstrating that his relationship with the Holy See was no longer harmonious by the end
Lucas, Archbishop of Esztergom