Introduction:
The Mughal Empire, which ruled over most of the Indian subcontinent from the 16th to the 18th century, had a complex administrative system to govern their vast territories. In order to consolidate their rule, the Mughals appointed subadars (governors) to administer specific regions. These subadars held considerable power and authority, but they also sought to control the office of diwan (finance minister) for several reasons.

1. Control over Revenue:
- The office of diwan was responsible for managing the revenue collection in a region.
- By controlling the office of diwan, the subadars could ensure a steady flow of revenue to support their administration and military activities.
- The revenue collected through taxes, land revenue, and other sources was essential for maintaining the Mughal Empire and financing the luxurious lifestyle of the emperor and his court.

2. Patronage and Power:
- The diwan had the authority to distribute and allocate revenue among various departments and officials.
- By controlling this office, the subadars could reward their loyal supporters and allies with lucrative positions and grants.
- This helped them establish a network of patronage and consolidate their power within the region.
- It also enabled them to build a loyal following of officials who would support their rule and suppress any potential rebellions or challenges.

3. Influence over Economic Policies:
- The diwan played a crucial role in formulating and implementing economic policies.
- By controlling this office, the subadars could shape economic policies in their region to benefit their own interests and the interests of their supporters.
- They could manipulate tax rates, trade regulations, and other economic factors to maximize revenue and ensure economic stability.
- This allowed them to strengthen their control over the region's economy and exploit its resources for their own gain.

4. Check on the Diwan's Power:
- The diwan held significant power and influence over the administration due to their control over finances.
- By appointing their own loyal diwans, the subadars could ensure that the diwan does not become too powerful or challenge their authority.
- This also served as a check on corruption, as the subadars could closely monitor the financial activities and prevent embezzlement.

Conclusion:
In summary, the Mughal subadars sought to control the office of diwan in order to secure a steady revenue stream, consolidate their power, shape economic policies, and maintain a check on the diwan's power. The control over finances allowed them to govern their regions effectively and maintain a stable empire.