Explanation: In the Delhi Sultanate, nobles were drawn from different tribes and nationalities like the Turkish, Persian, Arabic, Egyptian and Indian Muslims.

• Iltutmish organized a Corps of Forty, all drawn from Turkish nobility and selected persons from this Forty for appointments in military and civil administration.
• The nobles were organized into several factions and were constantly engaged in conspiracies.
• Balban therefore abolished the Corps of Forty and thereby put an end to the domination of “Turkish nobles”.
• Alauddin Khalji also took stern measures against the “Turkish nobles” by employing spies to report to him directly on their clandestine and perfidious activities.

Source: NCERT