The establishment and expansion of the Delhi Sultanate led to the evolution of a powerful and efficient administrative system. At its zenith the authority of Delhi Sultan had extended as far south as Madurai. Although the Delhi Sultanate had disintegrated, their administrative system made a powerful impact on the Indian provincial kingdoms and later on the Mughal system of administration.
The Delhi Sultanate was an Islamic state with its religion Islam. The Sultans considered themselves as representatives of the Caliph. They included the name of the Caliph in the khutba or prayer and inscribed it on their coins. Although Balban called himself the shadow of God, he continued to practice of including the name of Caliph in the khutba and coins. Iltutmish, Muhammad bin Tughlaq and Firoz Tughlaq obtained mansur or letter of permission from the Caliph.
The office of the Sultan was the most important in the administrative system. He was the ultimate authority for the military, legal and political activities. There was no clear law of succession during this period. All the sons had equal claim to the throne. Iltutmish even nominated his daughter in preference to his sons. But such nominations or successions were to be accepted by the nobles. Sometimes ulemas played crucial role in accepting the succession to the throne. However, the military superiority remained the main factor in matters of succession.
Central Government
The Sultan was assisted by a number of departments and officials in his administration. The post of Naib was the most powerful one. The Naib practically enjoyed all the powers of the Sultan and exercised general control over all the departments. Next to him was the Wazir who was heading the finance department called Diwani Wizarat.