The British East India Company cemented their hold on the region following the Battle of Plassey in 1757 CE .
The city of Kolkata , then Calcutta , served for many years as the capital of British India .
The British East India Company cemented their hold on the region following the Battle of Plassey in 1757 CE , and the city of Kolkata , then Calcutta , served for many years as the capital of British India .