In which era of Indian history did the levy known as kharaj serve chiefly as a tax on agricultural land?

Correct Answer: Delhi Sultanate

Explanation:

1. Definition of Kharaj:
Kharaj refers to an agricultural land tax levied under Islamic law on non-Muslim property owners or landholders on conquered agricultural land.

2. Application during the Delhi Sultanate:
During the period of the Delhi Sultanate (1206–1526 CE), land revenue formed the economic backbone of the state. Kharaj served chiefly as a tax on agricultural produce. Sultans like Alauddin Khalji standardized and enhanced the collection of kharaj, setting the revenue demand at 50% of the gross agricultural yield determined through direct measurement of land.

3. Major Tax Classifications of the Era:
• Kharaj: Land tax on agricultural production.
• Jizya: Poll tax levied on non-Muslim subjects.
• Zakat: Religious tax assessed on Muslims.
• Khum: State share of war booty (one-fifth).

Thus, kharaj was primarily an agricultural land tax during the Delhi Sultanate period of Indian history.