Early 19th-century historian János Bárdosy claimed both Boleslaus and Elvin were the sons of Both (also Bot or Bat), the ispán of Bihar County.
He also possessed five vineyards in Bihar (present-day Biharia, Romania) and several villages along the river White Körös (Fehér-Körös or Crișul Alb).
[5] "[...] Because Your Holiness have supreme power and authority after God [...], We will reveal to Your Highness the injustices committed against Our Majesty by some disingenuous [...] prelates, who stirred up Our brother [Andrew] [...] against Us.
Prior to that, Cardinal Gregorius de Crescentio and other legal scholars visited the diocese in order to investigate the miracles of Ladislaus' tomb in 1191.
Literary historian László Dobszay considered the subsequent official hymn of St. Ladislaus with French influence reflects the studies of Elvin in Paris.
[5] After the exhumation, Elvin donated pieces of the relic to several churches, for instance to the newly founded collegiate chapter of Szeben (present-day Sibiu, Romania).
As Boleslaus' envoys were forbidden to leave Hungary, his brother Elvin departed to the Holy See to file a formal complaint against the king (alongside his own conflict with his cathedral chapter).
In order to finance his journey, Elvin sold his palace and the surrounding lands at Micske, in addition to his five vineyards, in Bihar County to his brother for 400 marks.
Pope Innocent entrusted Saul Győr, the Archbishop of Kalocsa to investigate the conflict, but Emeric hindered his activity by preventing his visitation to the royal court.
He denied any physical abuse and narrated that Boleslaus and Elvin, in addition to John, Bishop of Veszprém were leading prelates of Andrew's conspiracy against him.
Emeric narrated that, when he dismissed Mog – who betrayed him and defected to the court of Duke Andrew – from the position of Palatine of Hungary and attempted to install his partisan Mika Ják in his place, Elvin, using the ecclesiastical censure as political weapon, excommunicated the lord, because he had formerly captured one of the bishopric's clergymen, who functioned as a messenger of the king's enemies who supported Duke Andrew.