The duty of Muqtis in Medieval India was to maintain law and order in their iqtas, which were a form of land grants given to them by the ruling authority. Muqtis were appointed by the Sultan or the ruler and were responsible for the administration of these iqtas.

- Importance of Iqtas:
Iqtas played a crucial role in the revenue administration of the medieval Indian kingdoms. They were essentially revenue assignments given to nobles or military officers in exchange for their services to the state. The muqti, as the holder of the iqtas, had the right to collect revenue from the assigned territory.

- Role of Muqtis:
The primary duty of Muqtis was to maintain law and order in their iqtas. They were responsible for ensuring that the land was properly cultivated, taxes were collected efficiently, and justice was administered effectively. They had the authority to appoint local officials, maintain a police force, and resolve disputes within their iqtas.

- Law and Order:
Maintaining law and order was crucial in medieval India as it ensured stability and peace within the kingdom. Muqtis were responsible for preventing and resolving conflicts, enforcing the law, and protecting the rights of the people. They had the power to punish criminals, maintain public order, and safeguard the interests of the state.

- Revenue Collection:
Another important aspect of the Muqti's duty was the efficient collection of revenue from their iqtas. They had to ensure that taxes were collected on time and in the appropriate amount. This revenue was crucial for the functioning of the state, including the maintenance of the army, administration, and infrastructure development.

- Administration and Governance:
Muqtis also played a role in the overall administration and governance of their iqtas. They had to maintain records of landholdings, assess land revenue, and submit reports to the central authority. They were responsible for the welfare of their subjects, including providing relief during times of famine or natural disasters.

In summary, the duty of Muqtis in Medieval India was to maintain law and order in their iqtas, which included ensuring justice, collecting revenue, and administering the territories assigned to them. They played a crucial role in the governance and administration of the kingdom, acting as intermediaries between the central authority and the local population.