Lucas was styled as "saintly" by the records of Henry of Mügeln and Cistercian friar Alberic of Trois-Fontaines. According to Italian historian Odorico Raynaldi, Lucas died as an "eminent moral priest", who cured sick people of their various illnesses, honouring him as a saint. His canonisation was first initiated by Robert, Archbishop of Esztergom in 1231, who had several conflicts with Andrew II of Hungary and the intervening secular authority. This influenced Lucas to promote the political goals of Robert, according to historian Gyula Kristó. Upon his request, Pope Gregory IX entrusted Bulcsú Lád, Bishop of Csanád and two other clergymen on 28 August 1231 to conduct an investigation and send their report to Rome. After receiving the report and the letter in support of Andrew, the pope ordered papal legate Giacomo di Pecorari on 17 February 1233 to deal with the canonisation issue among other matters. However the protocol was lost and the canonisation was postponed. Egyed Hermann and József Félegyházy stated that the initiative failed in silence due to the Mongol invasion of 1241. Other historians argue Lucas was not necessarily a suitable and exemplary person for the Holy See as he has repeatedly represented the interests of his church against even the pope. Andrew's son, Béla IV unsuccessfully attempted to initiate his canonisation. There were some semi official attempts by some prelates afterwards, including Ignác Batthyány, János Scitovszky and József Mindszenty.