Introduction:
Kashi, also known as Varanasi, is a city located in the northern Indian state of Uttar Pradesh. It holds great historical and cultural significance and is considered one of the oldest continuously inhabited cities in the world. Kashi has been the capital of several ancient kingdoms throughout history.

The Capital of Kashi:
The capital of Kashi was Varanasi.

Explanation:
- Kashi, also known as Varanasi, has a rich history that dates back thousands of years.
- It has been an important center of trade, spirituality, and education since ancient times.
- Kashi has witnessed the rise and fall of various kingdoms and dynasties throughout its history.
- However, it is important to note that Kashi itself was never the capital of a major kingdom or empire.
- The city of Varanasi, also known as Kashi, served as a cultural and religious center rather than a political capital.
- The ancient city of Pataliputra, located in present-day Patna, Bihar, was the capital of several important empires, including the Maurya and Gupta empires.
- Taxila, located in present-day Pakistan, was a renowned center of learning and a capital during the time of the Gandhara kingdom.
- Kaushambi, located near present-day Allahabad, served as the capital of the Vatsa kingdom during ancient times.

Conclusion:
In conclusion, Kashi, also known as Varanasi, was never the capital of a major kingdom or empire. It held great cultural and religious significance and served as a center of trade, spirituality, and education. Other cities such as Pataliputra, Taxila, and Kaushambi served as capitals during different periods in ancient Indian history.