
Dasarath Basu arrived in the 11th century in Bengal. One of his descendants, Raghunandan Basu, was reconfirmed the Zamindari / Jagir of Shahpur pargana (Ulpur) by the Moghuls in the 16th century where his descendants settled.
The Basu Roy Chowdhury of Ulpur family lost their ancestral home in East Bengal (now Bangladesh) when India was divided in 1947.