NĀNO, BHĀĪ, an Ohrī Khatrī, was a devoted Sikh of Gurū Arjan's time. He once visited Amritsar and had the privilege of receiving instruction from the Gurū himself. The Gurū, as says Bhāī Manī Singh Sikhāṅ dī Bhagat Mālā, explained to him the importance of the Harimandar as a seat of veneration for the Sikhs.
See, also, Bhāī Gurdās, Vārāṅ, XI. 23