Explanation:

  Multan was the capital of Trigarta with its original name that is Mulasthan. The territory of Trigarta Kingdom is around the three rivers of Satluj, Beas, and Ravi. These Trigarta kings were allies of Duryodhana and enemies of Pandavas and Viratas. Their capital was named Prasthala. They attacked the Virata Kingdom aided by the Kurus to steal cattle from there. The Pandavas living there in anonymity helped the Viratas to resist the combined forces of Trigartas and Kurus.