Bhai Gurbakhsh, an Udasi, (Gurbakhsh Singh after initiation), was a devout Sikh of the time of Guru Gobind Singh Sahib. When Guru Gobind Singh Sahib left Anandpur Sahib, on December 5-6, 1705, he appointed Bhai Gurbakhsh Singh as caretaker of Gurdwara Sis Ganj and the other shrines of Anandpur Sahib. Later, when Gulab Singh (son of Shyam Singh, grandson of Baba Suraj Mall and great-grandson of Guru Hargobind Sahib) tried to pretend himself as the Guru of the Sikhs, Bhai Gurbakhsh Singh stopped him from doing so.
(Dr. Harjinder Singh Dilgeer)