The temple of Harihar Nath in Sonepur is believed to have been originally built by Lord Ram, the famous prince of Ayodhya, on his way to the court of King Janak to win the hand of Mata Sita.
It is further said that Raja Man Singh later got the temple repaired. The Harihar Nath temple, as it stands today, was built by Raja Ram Narain and the most recent repairs on the temple were undertaken by the Birlas.