Dildarnagar Kamsar, also known as Kamsar-O-Bar, is a fertile region located on the banks of the Ganges and Karamnasa rivers.

Its original name, Kamsar, is derived from Kamesaradih, the area where its founder, Raja Narhar Khan, lived in a small fort.

From there, the family spread across Zamania and the surrounding areas, establishing more than a hundred villages in the Ghazipur, Buxar, Kochas, and present-day Kaimur districts.

He was the eldest and most responsible member of his family and was entrusted with the management of the jagir and Sarkar of the region, which elevated him to the status of a nobleman.

One day, while his wife was sitting sadly on the veranda of her house, she saw a Sufi saint named Makhdum Sayyid Shah Juned Qadri.

Narhar recited the "kalma" at Sher Shah Suri's court, where he had gone to pay the lagan (revenue) of his realm.

The jagir’s origins trace back to Puranmal, a descendant of Kam Dev, who was a prominent figure in the area.

The estate as per Ain-i-Akbari had a cultivation area of 66,548 bighas with a revenue demand of 2,760,000 dams, providing 50 horse and 5,000 foot soldiers.

Following his death in a dispute with Man Singh Rai of Reotipur, his cousin Raja Daud Khan avenged him and assumed control of Dewaitha (then Daudpur) and the Kamsar region succeeding Quttul.

The jagir fragmented into smaller estates, each governed by individual villages, including those in Dildarnagar Kamsar.

Kamsaries became, notable people of the region establishing small Zamindari estates during Mughals such as Dewaitha (Daudpur) or Khizirpur (Umarganj).

There were also some small battles fought in this region (at Seorai, Dildarnagar) during the time of foreign invasions in the area or any big robbery.

Kamsaries during British Raj seemed to be annoyed, by the rule, they also took part in the rebellion of 1857, started by Kunwar Singh, ruler of Jagdishpur estate, which consisted chiefs and many zamindars of Kamsaar region.

Their efforts in education, social reforms, and community development laid the foundation for progress in Dildarnagar Kamsar.