Viktor Kanász, assistant research fellow of the Fraknói Research Group, gave a lecture at The Pontifical University of John Paul II in Krakow, at the international conference Reforms, Institutions, Customs –Conflicts over the Course of History which was held between 7–8 June 2018. In his lecture, he enlightened the circumstances of the murder of György Fráter (Georgius Martinuzzi), and the following enquiry at the Holy See. (The article is available here.)