In 1765, when East India Company acquired the "diwani" of Bardhaman, it was composed of Bardhaman, Bankura, Hooghly and a third of Birbhum. Hooghly was separated in 1820, Bankura and Birbhum in 1837. In 1765, Tilakchand Ray was the "zamindar" of Bardhaman. He controlled 75 "parganas" and also looked after the law and order. At the time of the Permanent Settlement of Lord Cornwallis in 1793, the "chaklas" were reduced in size, in order to make them more manageable, and districts were created. Six subdivisions were created in Bardhaman district – Bud Bud in 1846, Katwa, Raniganj, Jahanabad (later named Arambagh), and Bardhaman Sadar in 1847 and Kalna in 1850. The "parganas" were converted to "thanas" (police stations). At that time there were 22 "thanas" in Bardhaman district. Later, Jahanabad was transferred out of Bardhaman. Some minor changes went on taking place.