of Limbuwan in 849 AD- 865 AD. He made many religious and social reforms in Limbuwan. Uba Hang's worthy son Mabo Hang succeeded him in 865 AD and ruled till 880 AD. Uba Hang kept on with the reforms his father had started. Uba Hang was succeeded by his son Muda Hang. Muda Hang was a weak ruler so the local chiefs started ruling their areas independently. Muda Hang was succeeded by his son Wedo Hang, by this time Limbuwan was in chaos and every principality was ruling independently and fighting with each other. Wedo hang was murdered and his son Chemjonghang succeeded. Rise of King Sirijonga Hang During this chaos and the waning phase of King Chemjong hang, King Sirijonga of Yangwarok kingdom rose to power. He subdued all the independent rulers and took over as the new supreme ruler of Limbuwan. He built two big forts in Phedap (present-day Terhathum district) and Chainpur (present-day Sankhuwasabha district). The remains of the structure still stand today. One of legacy was that he brought all the Limbus under the same writing system in Limbu script. He also brought feudal reform in Limbuwan and divided Limbuwan into new boundaries and districts. 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 Kangchenjunga range (present-day eastern border of Nepal) and Teesta River to the Bhutia Kings of Sikkim. Since then Limbuwan comprises all the area between Arun River and Koshi River in the west to Kunchenjunga Mountains and Mechi River in the east. At the beginning of the 15th century, the descendants of King Sirijonga hang became weak and Limbuwan again fell into chaos and anarchy. At the time, the two Yakthung Ing brothers from Kamrup Assam, had come and proclaimed the independent country of Phedap, Pokblabang and Bijayapur, Morang. The elder brother Sidi Ing became king of Poklabang, Phedap and the Lowland Limbuwan Kingdom of Morang was King Sangla Ing. After the 17th generations of the King Sidi Ing , got a glorius king Tena Hang. He had seven sons and called them as "Satre Nu hang" or "Sat Raya." Among of them Yen Hang Mukpa Raya was the king of Phedap and the descendants of him goes on "Sambahangphe" Limbus. The 21st descendant of King Sidi Ing, named Aatahang