Trigarta kingdom was an ancient kingdom in the Northern India region of the Indian subcontinent with its capital at Prasthala(modern Jalandhar) and fort in Kangra.
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 is one of the ancient town in North Trigarta, extending westward to the Punjab area. 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. 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.
Historically, Trigarta first finds mention in the works of Panini from the 5th century B.C. who calls the inhabitants of Trigarta as "Ayudhjeevi Sangha" or a martial republic.
Trigarta next finds mention in the Mahabharata's Sabha Parv, where it is included along with a number of other states of the time. The Mahabharata was first penned down around the 4th century B.C. and continued to be written until the 4th century A.D. The founder of Trigarta is mentioned as Susarma/Susharman in the Mahabharata. He was credited with building the Nagarkot/Kangra fort.