Rajnagar is the nearest village to Madhubani, Bihar, India.

Maharajadhiraj Sir Rameshwar Singh Jha wanted to shift the headquarters of Raj Darbhanga from Darbhanga to Rajnagar and spent money in building palaces and temples and excavating or renovating tanks.

[1] The earthquake rendered the main palace through the Durga hall and the roof over the inner shrines into a mass of ruins and the marble image of the deity broke into pieces.

[1] The Shiva temple built on the South Indian model was beyond repair.

[2] The village is also the centre of trade in Euryale ferox (water berries).