Ruling Dynasty of Mithila is a book written by Amarkant Mishra. The author was the PA to His Highness, the late Dr. Sir Kameswar Singh, the Maharaja Dhiraja of Darbhanga. Mithila was the state territory of King Janak, where the King of Awadh Raja Dasharath had visited to marry his first son Lord Ram.

Mithila was a state with its own culture, literature and different philosophy of life. Acharya Sankaracharya was defeated here. Darbhanga was the town where the last Maharaja Sir Kameswar Singh made his state capital and constructed a monumental palace named Nargauna Palace. Dr. Sir Kameswar Singh was the biggest landlord in independent India. His role in independence was a prominent one. He was a member of the constituent assembly.

This book contains the entire scenario of the abolishment of the Zamindari system and all the changes that came during the change of reign from British to Indian rule. The book also contains the contribution of Maharaja Sir Kameswar Singh to the education, literature, and culture of Mithila at that time.