Trigarta was a kingdom mentioned in the epic Mahabharata. Mahabharata mentions two different Trigarta kingdoms, one in the west close to the Sivi Kingdom and the other north to the Kuru Kingdom. Modern Kangra district is one of the ancient town in North Trigarta, India, extending westward to the Punjab area. 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. Trigarta kings fought the Kurukshetra War and were killed by Arjuna,after a ruthless and bloody conflict. Arjuna also annihilated an Akshouhini (a large military unit) of Trigarta warriors called the Samsaptakas. These warriors had vowed to either die or kill Arjuna as part of a larger plan by Duryodhana to capture Yudhishthira alive. The Katoch Dynasty has been attributed to have ruled this area and the above story from the Mahabharata is recorded in their history. Maharaja Susharma Chand had fought against Arjuna. His son built the Kangra Fort.
See also 
- Narayan, R. K. (2000). The Mahabharata: A Shortened Modern Prose Version of the Indian Epic. University Of Chicago Press. pp. 151–166.