Post the famous revolt of 1857, The Fort Unchagaon was gifted by the British regime to the loyal jatzamindar of Moradabad, Raja Gursahai Singh.

On the death of Raja Gursahai Singh in 1898, his grandson Raja Karan Singh inherited the zamindari. He had no children & on his death in 1927, it was inherited by his grand nephew Raja Surendra Pal Singh who at time was 10 yrs old. The fort was completely renovated in 1933 when he got married to the daughter of Maharaja Kishan Singh of Bharatpur State in Rajasthan.