an Entity references as follows:
The Kingdom of Sikkim (Classical Tibetan and Sikkimese: འབྲས་ལྗོངས།, Drenjong), officially Dremoshong (Classical Tibetan and Sikkimese: འབྲས་མོ་གཤོངས།) until the 1800s, was a hereditary monarchy in the Eastern Himalayas which existed from 1642 to 16 May 1975, when it merged with the Republic of India. It was ruled by Chogyals of the Namgyal dynasty.