With regard of John Hunyadi's mother, Bonfini provides an alternative solution as well, stating that she was a distinguished Greek lady, but does not name her. According to Kubinyi, her alleged Greek origin may simply refer to her Orthodox faith. In a letter of 1489, Matthias Corvinus wrote that his grandmother's sister, whom the Ottoman Turks had captured and forced to join the harem of an unnamed Sultan, became the ancestor of Cem, the rebellious son of Sultan Mehmed II. Based on this letter, historian Kubinyi says that the "Greek connection cannot be discounted entirely". If Matthias Corvinus' report is valid, John Hunyadithe hero of anti-Ottoman warsand the Ottoman Sultan Mehmed II were first cousins. On the other hand, historian Péter E. Kovács writes that Matthias Corvinus's story about his family connection with the Ottoman Sultans was nothing but a pack of lies.