The Harmandir Sahib is the holiest Sikh gurdwara located in the city of Amritsar, Punjab, India. The city was founded in 1574 by the fourth Sikh guru, Guru Ram Das. The Harmandir Sahib was designed by the fifth guru, Guru Arjan, who had the cornerstone laid by the Muslim Sufi saint Sai Hazrat Mian Mir on 28 December 1588. Guru Arjan completed the Adi Granth, the holy scripture of Sikhism, in 1604 and installed it in the gurdwara.