Patna, formerly Pataliputra and Putna, is the capital of Bihar, India. There are 1.7 million people in the city proper and 2.4 million when the suburbs are included (2007). It is located on the south bank of the Ganga, just upstream from the confluence of the Gandak. Places of note include Agam Kuan (unfathomable well), dating back more than 2,000 years; the ruins of the original city from the third century B.C.E.; the 15th century Begu Hajjam mosque; the Takht Shri Harmandir Saheb, which commemorates the birth place of Gabind Singh Jee, the tenth head of the Sikh religion; and the Martyrs Memorial at the State Secretariat Building, which honors students killed by the British for raising an anti-colonial flag.