RĀI SIṄGH (d.1809), one of the leaders of the Kāroṛsiṅghīā misl was the son of Matāb Siṅgh of Mīrāṅkoṭ in Amritsar district, the avenger of the sacrilege perpetrated by Masse Khān, the Muslim chieftain, who had occupied the holy Harimandar and converted it into a place of revelry. Rāi Siṅgh was nursed back to health by the village elder, Natthā Khaihrā, when he as a small child was grievously wounded and left as dead by an imperial force that had come in search of his father. As Rāi Siṅgh grew up, he joined the jathā or band of Shiām Siṅgh of Nārlī, a commander of the Karoṛsiṅghīās, who gave him his daughter in marriage. At the conquest of Sirhind by the Sikhs in January 1764, Rāi Siṅgh occupied a number of villages in Samralā tahsīl of Ludhiāṇā district. Rāi Siṅgh built a mud fort at Mīrāṅkoṭ where he lived until his death in 1809. His son, Ratan Siṅgh Bhaṅgū, is the author of the famed Prāchīn Panth Prakāsh, which delineates in verse the history of the Sikhs during that stirring period.