Gurdwara Bangla Sahib is the most prominent Sikh gurdwara, or Sikh house of worship, in Delhi, known for its association with the eighth Sikh Guru, Guru Har Krishan, and the pool inside its complex.
After the passing away of Guru Har Rai the seventh Sikh Guru, Ram Rai and his masands(masand is derived from Arabic word masnad, meaning delegating authority of the sovereign) instigated Mughal Emperor Aurangzeb to issue a decree summoning Guru Harkrishan to his court. Ram Rai was elder brother of Guru Harkrishan. Guru Harkrishan decided to go to Delhi since he felt that the “sangat”, his followers had been misguided and he saw an oppurtunity in this to clear their misunderstandings. Meanwhile Sikhs of Delhi approached Mirza Raja Jai Singh, a strong devotee of Sikh Gurus to prevent any harm coming to Guru Harkrishan either by Aurangzeb or by the masands of Ram Rai.