Hatthi Singh (9.12.1705 – 11.2.1783) was the son of Sahibzada Ajit Singh (and grandson of Guru Gobind Singh Sahib) and Bibi Tara Bai (Tara Kaur). He was born at Agra (Uttar Pradesh). According to Bhatt Vahi Purabi Dakkhani, he Mata Sunder Kaur was present at the time of his birth.
As he grew up, he began pretending himself as Guru of the Sikhs. Mata Sunder Kaur discarded him and moved to Delhi. He spent later years of his life at Sindhi Mohalla, Burhanpur (district Nimar, Madhya Pradesh) and died there, issue-less, in 1783. He had four wives but could not have any child from anyone of them; thus bringing an end to the family of Guru Gobind Singh.
Some writers have mentioned him as son of Ajit Singh Palit which is wrong. Bhatt Vahis clearly mention that he was son of Sahibzada Ajit Singh.
Gurdwara Bari Sangat has been built at the site where he spent his last days. His memorilal has been built in the backyard of this Gurdwara.
(Dr Harjinder Singh Dilgeer)