 In the meantime, in 1641, when King Phuncho Namgyal became the king of Sikkim, independent Limbu kings of Tambar Kingdom, Yangwarok Kingdom, Panthar Kingdom and Ilam Kingdom allied with the Sikkimese king, effectively dividing Limbuwan in half.From the enthronement of King Puncho Namgyal of Sikkim in 1641 to 1741, the eastern and northern Limbuwan kings allied with the kings of Sikkim.From 1641 to 1741 for approximately a hundred years, the Limbu kings of Tambar, Yangwarok, Panthar and Ilam kingdoms allied with the King of Sikkim and saw him as their overlord.