Chainpur is a Town and corresponding community development block in Kaimur district of Bihar, India.

The town was originally established by, the desendants of Diwan Rao, a son Of Raja Dham Dev.

According to the shrine's tradition, the Kanyakubja Brahmin priest Harshu Pandey, who was in the service of Raja Shaliwahan, committed suicide in protest of the demolition of his house, but when his body was cremated at Varanasi, he was seen miraculously standing as if still alive.

Before even Bhabua came under the Jagir of Chainpur and was a small group of villages primarily established by Akhlash Khan of Ikhlashpur wo was a governor of Bihar during Shahjahan.

His elder brother was Kam dev who descendants established Sherpur, Reotipur (Dalpatpur), Dildarnagar Kamsar and many other places in Ghazipur and Bihar.

From the same place belonged Raja Deendardar Khan of Dildarnagar, During Mughal empire and early British era descendants of Dham Dev and Kam Dev ruled a very large part of Ghazipur district, Rohtasgarh, Kaimur region, and Chausa in Buxar.