تحفة النظار في غرايب الامصار وعجايب الاسفار 11.7.6

11.7.6

Then Sultan Nāṣir al-Dīn married his daughter before he became king, and when he became king he made him his deputy for twenty years; then Balban killed him and seized his kingdom for another twenty years, as was mentioned above! Sultan Balban had two sons. One was al-Khān al-Shahīd, his heir apparent, who was his father's governor in the land of Sind, residing in the city of Multān; he was killed in a war with the Tatars and left two sons, Kay Qubād and Kay Khusraw. Sultan Balban's second son was called Nāṣir al-Dīn and was his father's governor in the lands of Lakhnawtī