Question

The highest official who assisted the sultan

Answer 1

Is that vizier??????????????

Answer 2

Naib-i-Mulk. The post of Naib-i-Mamlakat is equal to the English expression "official" was made by the Turkish slave rulers. It was later called Naib-i-Mulk or Malik Naib (under Khilji). The Sultan overwhelmed the focal government as he was the legitimate leader of the state and gone about as the CEO and the most astounding court of appeal.

The Sultan was helped by various ministers. In them, Naib-i-Mulk or Malik Naib held the most noteworthy stature in the focal administration of the Sultanate.