Lepchas themselves were reported to be originally Nagas of the Mikir, Garo and Khasi hills who came to Sikkim and absorbed into their fold the pre-historic tribes of Naong, Chang and the Mon of Sikkim according to the Official History of Sikkim by the Government of Sikkim. However this is false. The signing of blood brotherhood in Kabi Lungchok was between three tribes Mon referring to Lepchas, Tsong or Chang or the Limbus and Lho, literally Southerners in Tibetan referring to the Bhutia migrants who settled in Sikkim.