In 1840 , Prithvi Singh , became the 15th Maharaja of Kishangarh .
In 1840 , Prithvi Singh , reigned till his death in 1879 , after which he was succeeded by his son , Sardul Singh .
In 1840 , Prithvi Singh , became the 15th Maharaja of Kishangarh , and reigned till his death in 1879 , after which he was succeeded by his son , Sardul Singh .