Sonbarsa Raj

Sonbarsa Raj
1660–1949
CapitalSonbarsa
Common languagesMaithili,
Hindi
Raja 
 1660
Raja Ranjit Singh (first)
 1949
Rao Bahadur Rudra Pratap Singh (last)
History 
 Established
1660
 Acceded to India
1949
CurrencyIndian Rupee
Succeeded by
Dominion of India
Today part ofBihar,
Republic of India

The Sonbarsa Raj was a medieval chieftaincy and later a zamindari (estate) during British Raj in modern-day Bihar, in erstwhile Bhagalpur district (now in Saharsa). It was controlled by the Gandhavariya Rajputs.

The grants and sanad shows that Gandhavariyas were important Rajas under the Mughals in sarkar Tirhut. Beside Sonbarsa, the Gandhavarias landlords were found in Baruari, Parsarma, Barail, Sokhpur, Jadia, Basantpur, Durgapur, Sukhsena, Bhatattan, Panchgachhia etc.

The Zamindari estate of Mangwar established by Babu Bhagwan Singh also belongs to the Gandhavaria clan, whose descendants Babu Sagar Prasad Singh lives there.