Iltutmish had groomed his eldest son Nasiruddin Mahmud to be his successor, but this son died unexpectedly in 1229. While leaving for his Gwalior campaign in 1231, Iltutmish left his daughter Razia as the in-charge of Delhi's administration.
Iltutmish planned for his eldest son Nasiruddin Mahmud to succeed him but he died unexpectedly in 1229.  While on his way to Gwalior in 1231, Iltutmish entrusted his daughter Razia with the management of Delhi.