Explanation:

 King Virat was the father of Abhimanyu 's wife Uttara in Mahabharata .
With the name of King Viraat, Virat Nagar was a famous district of Mahabharata period. In this country there was the reign of Virat and there was a capital city called Upplav. Virat Nagar was the second major city of the Matasya Mahajanapada .
When Pandavas were unknown , at that time Arjuna , Brihnala were living in the name. Vrinhala gave instruction to Uttara to dance , music etc.
At that time , when the Kauravas had captured King Viraat's cows, Arjuna had shown a mighty war with the Kurus at that time.