Harisimhadeva (also called Hari Singh Deva) was a King of the Karnat dynasty who ruled the Mithila region of modern-day parts of North Bihar in India and South Nepal.
[6] The reign of Harisimhadeva was considered a landmark point in the history of Mithila with many events taking place during his four-decade rule.
[8] Inscriptions detail that the Karnats of Mithila under Harisimhadeva had several battles with invading Muslim kings and were victorious in many instances but were eventually defeated.
His descendants eventually founded the Malla dynasty which ruled Kathmandu and the surrounding areas for roughly 600 years.
[10] Evidence also shows that other descendants of Harisimhadeva including a King Prithvisimhadeva were continuing to rule in Champaran district of Bihar into the 15th century.