تحفة النظار في غرايب الامصار وعجايب الاسفار 13.107.4

13.107.4

Then Sultan Nāṣir al-Dīn killed the son of his paternal aunt, who was married to the daughter of Sultan Ghiyāth al-Dīn, and married her after him. He learned that Malik Masʿūd had visited [that man] in his prison before his death, so he killed him too; and he killed Malik Bahādur, who was one of the brave, generous and virtuous men.