The origin and history of the name "Chemjong" comes from the era of Lasahang(LashaHang which was during the dynasty of Limbuwan.
Eventually after the establishment of Namgyal dynasty in Sikkim and under the Lho-Mehn-Tsong Tsum, a treaty between the Bhutia, Lepcha and Limbu people of the Sikkim area, Limbuwan lost the area between Kunchenjunga range (present day eastern border of Nepal) and Teesta River to the Bhutia Kings of Sikkim.
Limbuwan |
The treaty between the other Limbuwan states and the King of Gorkha (Gorkha-Limbuwan Treaty of 1774 AD) and the conflict of Gorkha and Sikkim led to the unification of Ilam with Gorkha.