Who was the first ruler among these to accept the title of Khalifa (Caliph's delegate) in the Delhi Sultanate?

دہلی سلطنت میں خلیفہ (خلیفہ کے مندوب) کے لقب کو قبول کرنے والے ان میں پہلا حکمران کون تھا؟

Iltutmish

Balban

Razia Sultana

None of these

Explanation

Iltutmish (Reign: 1211–1236 CE):

The first Delhi Sultan to formally accept the title of "Naib-i-Amir-ul-Momineen" (Deputy of the Caliph) from the Abbasid Caliph in Baghdad (1229 CE).

This legitimized his rule under Islamic law.