Nasir ud din Mahmud, Nasir ud din Firuz Shah (1246–1266) was the eighth sultan of the Mamluk Sultanate (Slave dynasty). He was the son of Nasiruddin Mahmud (died 1229), who was the youngest son of Shams ud din Iltutmish (1211–1236). He was named after his father, by Shams ud din Iltutmish, for he had grown an intense filial attachment, to the only begot son of his posthumous child. He succeeded Ala ud din Masud after the chiefs replaced Masud when they felt that he began to behave as a tyrant.