Secunderabad or Sikandar-a-bad , popularly known as the twin city of Hyderabad is located in the Indian state of Telangana. Named after Sikandar Jah, the third Nizam of the Asaf Jahi dynasty, Secunderabad was founded in 1806 as a British cantonment. Although Hyderabad and Secunderabad are together referred to as the twin cities, they have both different histories and cultures, with Secunderabad having developed directly under British rule until 1948 and Hyderabad as the capital of the Nizams' princely state. This popular cultural city has been geographically divided from Hyderabad by Hussain Sagar lake. Therefore, Secunderabad is no longer a separate municipal unit and has become part of Hyderabad's GHMC municipality. Both cities are also known as Hyderabad and form the sixth largest metropolitan city in India.