[...] "As I see your heart filled with the advancement and unity of the Church, may I also contribute to this by reporting to Your Excellency that Our Lord King [Géza II], allowing my requests, accepted and confirmed Lord Alexander [as Pope] altogether with Our whole Church.
In making this final decision, we persevered in the matter and have already sent to Lord Alexander the King's letter, along with my insignificance's letter.
And further, if we can please your Holiness something, tell me and that I am willing to obey in accordance with my talent."

— Archbishop Lucas' letter (missilis) to Archbishop Eberhard of Salzburg in 1161
Martyrius, Archbishop of Esztergom died in the spring of 1158 and was soon succeeded by Lucas.
Apa and Lucas became the strongest proponents of Géza II during his last regnal years and respectively held the most distinguished secular and ecclesiastical dignities.
When the king made a donation in favor of the Cathedral of Saint Domnius and its archbishop Gaudius twice in 1158, the brothers only appeared in his accompaniment by name.
Lucas'  sympathized with the reformist wing in the Roman Curia, which also affected Géza II's foreign policies in the following years.
He was dubbed as the "representative of extreme Gregorianism" in Hungary by later scholars.
As theologian József Török expressed, Lucas "vigilantly guarded the interests of the legitimate Pope [Alexander III] and the Church" during his first years as archbishop.
He was one of the first Hungarian prelates who thought on a whole European and Christian universalist scale and integrated into the contemporary mainstream school of clerical theology.
Literary historian János Győry suggested that Lucas sympathized with the heretic movements prevalent in the region – Albigensians, Patarenes and Bogomils, but the majority of scholars do not share this fringe theory.

Initially, Géza II supported the efforts of Frederick Barbarossa against the pro-papal Italian communes (that were later known collectively as the Lombard League), and even sent Hungarian auxiliary troops to accompany the Holy Roman Emperor to Italy between 1158 and 1160.
Barbarossa forced the Italian towns to surrender in September 1158.
However, Milan and Crema openly rebelled against the emperor's rule after the Diet of Roncaglia ordered the restoration of imperial rights.
Géza II sent his envoys to Barbarossa's camp and promised to dispatch further reinforcements against the rebellious towns.
The death of Pope Adrian IV on 1 September 1159 divided the college of the cardinals: the majority of the cardinals opposed Barbarossa while a minority supported him.
The first group elected Alexander III as pope, but Barbarossa's supporters chose Victor IV instead.
Barbarossa convened a synod to Pavia to end the schism.
Géza II sent his envoys to the church council where Victor IV was declared the lawful pope in February 1160.
However, Archbishop-elect Lucas remained loyal to Alexander III and persuaded Géza II to start negotiations with Alexander III's representatives.
Géza II switched allegiances after most of the other European monarchs joined Alexander III.
Géza II's envoys announced his decision to Alexander III in early 1161, but he only informed the emperor of his recognition of Alexander III in the autumn of the same year.
A letter from Lucas to his ally, Eberhard, Archbishop of Salzburg, who was the leading pro-Alexander figure in the Holy Roman Empire, revealed his influence carried significant weight with Géza II when he changed the direction of his foreign policy.
Lucas presented the case as if he alone had been responsible for Géza II's recognition of Pope Alexander, as he wrote "I have managed through appeals to cause our Lord the King and our whole church to accept Alexander".
Several historians – including Gyula Pauler and József Gerics – accepted the letter's contents and considered Lucas' significant role in negotiating with the pro-Barbarossa envoy, Bishop Daniel of Prague in 1161 at Easter before Daniel's official meeting with Géza II.
However, Ferenc Makk notes there is
[...] "As I see your heart filled with the advancement and unity of the Church, may I also contribute to this by reporting to Your Excellency that Our Lord King [Géza II], allowing my requests, accepted and confirmed Lord Alexander [as Pope] altogether with Our whole Church. In making this final decision, we persevered in the matter and have already sent to Lord Alexander the King's letter, along with my insignificance's letter. And further, if we can please your Holiness something, tell me and that I am willing to obey in accordance with my talent."
— Archbishop Lucas' letter (missilis) to Archbishop Eberhard of Salzburg in 1161
Martyrius, Archbishop of Esztergom died in the spring of 1158 and was soon succeeded by Lucas. Apa and Lucas became the strongest proponents of Géza II during his last regnal years and respectively held the most distinguished secular and ecclesiastical dignities. When the king made a donation in favor of the Cathedral of Saint Domnius and its archbishop Gaudius twice in 1158, the brothers only appeared in his accompaniment by name. Lucas'  sympathized with the reformist wing in the Roman Curia, which also affected Géza II's foreign policies in the following years. He was dubbed as the "representative of extreme Gregorianism" in Hungary by later scholars. As theologian József Török expressed, Lucas "vigilantly guarded the interests of the legitimate Pope [Alexander III] and the Church" during his first years as archbishop. He was one of the first Hungarian prelates who thought on a whole European and Christian universalist scale and integrated into the contemporary mainstream school of clerical theology. Literary historian János Győry suggested that Lucas sympathized with the heretic movements prevalent in the region – Albigensians, Patarenes and Bogomils, but the majority of scholars do not share this fringe theory.
Initially, Géza II supported the efforts of Frederick Barbarossa against the pro-papal Italian communes (that were later known collectively as the Lombard League), and even sent Hungarian auxiliary troops to accompany the Holy Roman Emperor to Italy between 1158 and 1160. Barbarossa forced the Italian towns to surrender in September 1158. However, Milan and Crema openly rebelled against the emperor's rule after the Diet of Roncaglia ordered the restoration of imperial rights. Géza II sent his envoys to Barbarossa's camp and promised to dispatch further reinforcements against the rebellious towns. The death of Pope Adrian IV on 1 September 1159 divided the college of the cardinals: the majority of the cardinals opposed Barbarossa while a minority supported him. The first group elected Alexander III as pope, but Barbarossa's supporters chose Victor IV instead. Barbarossa convened a synod to Pavia to end the schism. Géza II sent his envoys to the church council where Victor IV was declared the lawful pope in February 1160. However, Archbishop-elect Lucas remained loyal to Alexander III and persuaded Géza II to start negotiations with Alexander III's representatives. Géza II switched allegiances after most of the other European monarchs joined Alexander III. Géza II's envoys announced his decision to Alexander III in early 1161, but he only informed the emperor of his recognition of Alexander III in the autumn of the same year. A letter from Lucas to his ally, Eberhard, Archbishop of Salzburg, who was the leading pro-Alexander figure in the Holy Roman Empire, revealed his influence carried significant weight with Géza II when he changed the direction of his foreign policy. Lucas presented the case as if he alone had been responsible for Géza II's recognition of Pope Alexander, as he wrote "I have managed through appeals to cause our Lord the King and our whole church to accept Alexander". Several historians – including Gyula Pauler and József Gerics – accepted the letter's contents and considered Lucas' significant role in negotiating with the pro-Barbarossa envoy, Bishop Daniel of Prague in 1161 at Easter before Daniel's official meeting with Géza II. However, Ferenc Makk notes there is
Lucas, Archbishop of Esztergom