19) The first Muslim ruler who consider his kingdom as a part of Darul Islam?

20) Iltutmish died in 1236 A.D while fighting with the

21) Delhi Sultanate got Kalifa recognition during the period of

22) The Mongol leader who invaded Delhi Sultanate during the period of Iltutmish

23) What was the period of Iltutmish as Sultan of Delhi?