[4] Between around 1254 and 1261, during the pontificate of Pope Alexander IV, Báncsa was made canon of Fenton by cardinal Ottaviano degli Ubaldini, his uncle's ally within the Roman Curia.
However after the decision, Demetrius' envoys, provost James and canon Elias appeared in the Roman Curia to complain the confirmation, citing Báncsa's young age, "illiteracy" and the "unlawful method" of the election.
Clement commissioned three cardinals, John of Toledo, Matteo Rosso Orsini and Guillaume de Bray to investigate the case, who found the charges regarding the allegations of his minor age against Báncsa was unfounded.
In his judgment letter on 11 February 1267, Pope Clement explained Báncsa's erudition and science skills at length (mentioning his studies at Bologna) and maintained his decision.
[9] Historians Tibor Almási and László Koszta considered Báncsa's election to contest the pro-Béla Demetrius was due to the intervention of Duke Stephen, who ruled the eastern parts of the kingdom after the brief civil war with his father Béla IV.
[11] The hospes (foreigner) gold miners of Rimaszombat (today Rimavská Sobota, Slovakia), who belonged to the Archdiocese of Kalocsa, were granted privileges of free election of judges (i.e. community leaders), masses in their native languages and release from warfare by Báncsa in his 1268 and 1270 charters.
In addition, Philip Türje died on 18 December 1272, leading to the status of seven years of vacancy in the Archdiocese of Esztergom, when the feudal anarchy infiltrated into the church organization.
The council drew up plans for a crusade to recover the Holy Land, and the pope ordered Báncsa to organize the armies in his towns on 26 September 1275, but he remained passive.
[13] When Peter Monoszló, Bishop of Transylvania intended to extend the bishopric's influence over the provostry of Szeben (today Sibiu, Romania) in 1277, he had to face with a widespread revolt among the Saxons.
The rebellion spread quickly, the infuriated Saxons stormed into the newly built St. Michael's Cathedral, see of the diocese on 21 February, looted the treasury, desecrated the shrines and massacred there about 2,000 asylum seekers, including canons, archdeacons and other priests.