THARĀJ SIṄGH, an eighteenth century warrior, was one of seven sons of Bhāī Nāgahīā, grandson of Bhāī Kālā of Lauṅgovāl. Receiving the vows of Khālsā discipline at the hands of Bhāī Manī Siṅgh, he chose to stay with him at Amritsar to defend the Harimandar against the onslaughts of the Mughals and Afghāns. Tharāj Siṅgh attended on Nawāb Kapūr Siṅgh as his bodyguard and obtained from him a command of 100 soldiers. He fought in the battle of Sirhind (1764) at which he is said to have cut off the head of the faujdār, Zain Khān. When Khushāl Siṅgh, nephew and successor of Nawāb Kapūr Siṅgh, carved out for himself the Siṅghpurīa principality, he put Tharāj Siṅgh in charge of Bharatgaṛh, one of the major towns within his territory.
Tharāj Siṅgh died fighting for his chief in one of his battles of conquest.