Maharaja Sir Harendra Kishore Singh was the last king of Bettiah Raj. He was born in 1854 and succeeded his father, the late Maharaja Rajendra Kishore Singh Bahadur in 1883. In 1884, he received the title of Maharaja Bahadur as a personal distinction and a Khilat and a sanad from the hands of the Lieutenant Governor of Bengal, Sir Augustus Rivers Thompson. He was created a Knight Commander of the Most Eminent Order of the Indian Empire on 1 March 1889. He was appointed a member of the Legislative Council of Bengal in January 1891. He was also a member of The Asiatic Society He was the last ruler of Bettiah Raj. Maharaja Sir Harendra Kishore Singh Bahadur died heirless on 26 March 1893, leaving behind two widows, Maharani Sheo Ratna Kunwar and Maharani Janki Kunwar.